Gamma-O Ingredients & Drug Interactions
by Gamma Labs
What is this page for?
First and foremost: checking Gamma-O against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
Gamma-O is a dietary supplement by Gamma Labs with 6 active ingredients. Its ingredients are commonly taken for high cholesterol, menopausal symptoms, athletic performance and muscle building.Based on those ingredients, 870 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Vitamin D, Indole-3-Carbinol. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Gamma-O by Gamma Labs
Ask about any prescription or over-the-counter medication and we check it for interactions with Gamma-O by Gamma Labs — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Gamma-O by Gamma Labs
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
Gamma-O contains 7 ingredients: three are active compounds — gamma oryzanol, vitamin D, and indole-3-carbinol — and four are fats and oils (polyunsaturated fat, monounsaturated fat, conjugated linoleic acid, and rice bran oil in the inactive list). The product also contains standard capsule materials and colorants like gelatin, titanium dioxide, and FD&C yellow dyes.
Does it work?
Not established
The evidence for this product is mixed. Gamma oryzanol is possibly effective for high cholesterol and triglycerides (dyslipidemia), but there isn't enough reliable evidence to say whether it helps with athletic performance or eczema.
Vitamin D is effective for serious deficiency diseases like rickets and renal bone disease, but that's not what most people use this product for. Indole-3-carbinol hasn't shown reliable evidence for any of the conditions it's been studied in — breast cancer, ovarian cancer, cervical dysplasia, liver disease, colorectal cancer, and fibromyalgia.
Maca root also has insufficient evidence for any of its proposed uses.
How safe is it?
Well-documented data
Vitamin D is generally well tolerated at recommended doses, though very high doses over time can cause toxicity with symptoms like high blood calcium, bone loss, and eye problems. Gamma oryzanol is generally well tolerated in studies, but long-term safety hasn't been fully established.
Indole-3-carbinol is well tolerated in most people but may cause diarrhea, nausea, rash, tremor, or unsteadiness — especially at higher doses. Maca root as a food is well tolerated, but supplement safety hasn't been studied long term; fresh, uncooked maca can cause stomach pain.
Meds to double-check
Moderate interaction found
Before taking Gamma-O, double-check whether you take any thiazide diuretics, heart rhythm medications (verapamil, diltiazem), digoxin, atorvastatin, blood thinners or antiplatelet drugs, estrogen therapy, or any medications broken down by your liver. The vitamin D content also poses a moderate risk with high-dose supplements of calcipotriene and with aluminum-containing products.
If you're unsure whether any of your drugs fall into these groups, ask your doctor or pharmacist to review your medication list against this product before you start.
The bottom line
Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.
Gamma-O may interest people looking to support cholesterol levels (through gamma oryzanol) with added vitamin D and other plant compounds. However, the vitamin D and indole-3-carbinol here interact with a significant number of medications — especially heart drugs, blood thinners, and cholesterol meds — so this isn't a grab-it-yourself product if you take prescription medications.
The evidence that it actually works for most of its marketed purposes is thin. Check your medications against the interactions listed here, and talk with your doctor or pharmacist before starting it.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 4 of 7 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Apr 25, 2017.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about Gamma-O, straight from the product label.
| Brand | Gamma Labs |
|---|---|
| Barcode (UPC) | 794504646900 |
| Net contents | 120 Liqui-Cap(s) |
| Market status | On market |
| Date entered into DSLD | Apr 25, 2017 |
| DSLD ID | 73266 |
| Product type | Other Combinations |
| Supplement form | Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Adult Male (18-50 Years) |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for Gamma-O by Gamma Labs, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Calories | 7 Calorie(s) | 2% |
| Calories from Fat | 6 Calorie(s) | -- |
| Protein | 0.2 g | 2% |
| Saturated Fat | 0 g | 2% |
| Polyunsaturated Fat | 0.5 g | -- |
| Trans Fat | 0 g | -- |
| Monounsaturated Fat | 0.1 g | -- |
| Gamma Oryzanol | 500 mg | -- |
| Vitamin D | 1500 IU | 375% |
| Total Fat | 0.6 g | 2% |
| Conjugated Linoleic Acid | 500 mg | -- |
| Indole-3-Carbinol | 150 mg | -- |
| Maca root powder | 100 mg | -- |
Other ingredients: Gelatin, Rice Bran Oil, D-Alpha-Tocopheryl Acetate, FD&C Yellow #5, FD&C Yellow #6, Titanium Dioxide
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
General
VER102513
General Statements
Gamma-O has been demonstrated to naturally increase testosterone levels while burning off excess fat.
This product was manufactured in an NSF GMP Certified facility.
Muscle
Strength
Libido
Stamina
Advanced pro formula
Natural testosterone booster
Burns fat with CLA
V2 series
Formula
Our new and improved Version 2 (V2) Pro Formula contains Gamma Oryzanol and Vitamin D to boost testosterone and increase strength.
We incorporate Indole-3-Carbinol (I3C), a potent anti-estrogen, and Maca Root which is known for its positive effect on sexual performance.
Our proprietary process of combining CLA with these ingredients to produce our flagship liquid emulsion will aid in muscle growth, reduced estrogen levels, increased libido and faster recovery times.
FDA Disclaimer Statement
These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Seals/Symbols
100% Approved No Banned Substances
FDA Statement of Identity
Dietary Supplement
Suggested/Recommended/Usage/Directions
Directions: Take 2 liqui-caps twice daily with food. A daily dosage of 4 capsules per day ensures a 1 month supply in every bottle.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Gamma-O by Gamma Labs label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in Gamma-O by Gamma Labs
These are the 6 active ingredients this product is made of. Select any to open its full monograph.
Serving size2 Capsule(s) Dosage formCapsule Servings per container60 Amounts shown are per serving.
Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.
Protein
Gamma Oryzanol
No knowninteractions
Gamma-oryzanol is a mix of plant compounds taken from rice bran oil, used mainly for cholesterol, menopause symptoms, and as a sports supplement. The...
Gamma Oryzanol monograph & interactionsVitamin D
Interacts with715 drugs
Vitamin D is a fat-soluble vitamin that helps your body absorb calcium and is important for healthy bones, muscles, and immune function. Many people,...
Vitamin D monograph & interactionsConjugated Linoleic Acid
Indole-3-Carbinol
Interacts with294 drugs
Indole-3-carbinol (I3C) is a compound formed when you eat cruciferous vegetables like broccoli and cabbage, and it is sold as a supplement mainly for...
Indole-3-Carbinol monograph & interactionsMaca root powder
No knowninteractions
Maca is a nutrient-rich Andean root often used for energy, libido, and menopause symptoms. Early studies suggest it may modestly help sexual desire an...
Maca root powder monograph & interactionsOther (inactive) ingredients: Gelatin, Rice Bran Oil, D-Alpha-Tocopheryl Acetate, FD&C Yellow #5, FD&C Yellow #6, Titanium Dioxide. These complete the product’s ingredient list but are not active constituents.
Gamma-O by Gamma Labs Drug Interactions
HelloPharmacist Interaction Report
Gamma-O by Gamma Labs contains several ingredients with documented drug interactions.
The most serious concern comes through its vitamin D content, which poses a Moderate risk with thiazide diuretics — high-dose vitamin D can raise blood calcium levels (hypercalcemia) when combined with these blood pressure medications, potentially causing harmful effects.
Read the full breakdown — every affected drug type, severity by severity
Vitamin D also interacts moderately with heart rhythm medications (verapamil and diltiazem), the heart medication digoxin, the cholesterol drug atorvastatin, calcipotriene (a topical psoriasis treatment), aluminum-containing products, and an entire group of medications processed through the liver enzyme CYP3A4. Additionally, indole-3-carbinol in this product has moderate interactions with blood thinners and antiplatelet drugs (raising bleeding risk), estrogen therapies, and medications metabolized by the liver enzyme CYP1A2.
We could not check polyunsaturated fat, monounsaturated fat, or conjugated linoleic acid — we hold no data for them. Gamma oryzanol and maca root powder show no interactions in our data.
Altogether, these interactions span 871 individual medications.
Before you start Gamma-O, use the medication checker on this page to see if any of your prescriptions or over-the-counter drugs fall into these categories, and run the results by your doctor or pharmacist.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Gamma-O?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Gamma-O interact with 870 drugs. Click any drug to see the details.
2 of the 6 ingredients in Gamma-O interact with drugs. Each result below shows which ingredient is responsible. Vitamin D Indole-3-Carbinol
Aspirin, OxycodonePercodan
How Aspirin, Oxycodone interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
Read the full Indole-3-carbinol + Aspirin, Oxycodone interactionAspirin, PentazocineTalwin Compound
How Aspirin, Pentazocine interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolAnticoagulant/antiplatelet Drugs, Cytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
Read the full Indole-3-carbinol + Aspirin, Pentazocine interactionAtenolol, ChlortalidoneAtenixCo, Tenoret 50, Totaretic
How Atenolol, Chlortalidone interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Atenolol, Chlortalidone interactionAtenolol, ChlorthalidoneTenoretic
How Atenolol, Chlorthalidone interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Atenolol, Chlorthalidone interactionAtorvastatinAtorvaliq
How Atorvastatin interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates, Atorvastatin (lipitor) Moderate
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Atorvastatin interactionAtorvastatin CalciumLipitor
How Atorvastatin Calcium interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAtorvastatin (lipitor), Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Vitamin D might reduce absorption of atorvastatin.
Read the full Vitamin D + Atorvastatin Calcium interactionAzilsartan, ChlorthalidoneEdarbyclor
How Azilsartan, Chlorthalidone interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Azilsartan, Chlorthalidone interactionBazedoxifene Acetate, Conjugated EstrogensDuavee
How Bazedoxifene Acetate, Conjugated Estrogens interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolEstrogens Moderate
Interaction Summary
Indole-3-carbinol might interfere with the effects of estrogen therapy.
Read the full Indole-3-carbinol + Bazedoxifene Acetate, Conjugated Estrogens interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Bazedoxifene Acetate, Conjugated Estrogens interactionBelladonna, Caffeine, Ergotamine, PentobarbitalMicomp PB
How Belladonna, Caffeine, Ergotamine, Pentobarbital interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Belladonna, Caffeine, Ergotamine, Pentobarbital interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Belladonna, Caffeine, Ergotamine, Pentobarbital interactionBellafoline, Caffeine, Ergotamine Tartrate, PentobarbitalCafergot PB
How Bellafoline, Caffeine, Ergotamine Tartrate, Pentobarbital interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Bellafoline, Caffeine, Ergotamine Tartrate, Pentobarbital interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Bellafoline, Caffeine, Ergotamine Tartrate, Pentobarbital interactionBenazepril, HydrochlorothiazideLotensin HCT
How Benazepril, Hydrochlorothiazide interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Benazepril, Hydrochlorothiazide interactionBendamustineBelrapzo, Treanda, Vivimusta
How Bendamustine interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Bendamustine interactionBendamustine HydrochlorideBendeka
How Bendamustine Hydrochloride interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Bendamustine Hydrochloride interactionBendroflumethiazideAprinox, Naturetin, Neo-NaClex
How Bendroflumethiazide interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Bendroflumethiazide interactionBendroflumethiazide, NadololCorzide
How Bendroflumethiazide, Nadolol interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Bendroflumethiazide, Nadolol interactionBendroflumethiazide, PotassiumCentyl K, Neo-NaClex-K
How Bendroflumethiazide, Potassium interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Bendroflumethiazide, Potassium interactionBendroflumethiazide, Rauwolfia SerpentinaRauzide
How Bendroflumethiazide, Rauwolfia Serpentina interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Bendroflumethiazide, Rauwolfia Serpentina interactionBenzhydrocodone, AcetaminophenApadaz
How Benzhydrocodone, Acetaminophen interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Benzhydrocodone, Acetaminophen interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Benzhydrocodone, Acetaminophen interactionBenzthiazideExna
How Benzthiazide interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Benzthiazide interactionBetamethasone Dipropionate, CalcipotrieneEnstilar, Wynzora
How Betamethasone Dipropionate, Calcipotriene interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCalcipotriene (dovonex) Moderate
Interaction Summary
Taking calcipotriene with vitamin D increases the risk for hypercalcemia.
Read the full Vitamin D + Betamethasone Dipropionate, Calcipotriene interactionBetrixabanBevyxxa
How Betrixaban interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
Read the full Indole-3-carbinol + Betrixaban interactionBisoprolol, HydrochlorothiazideZiac
How Bisoprolol, Hydrochlorothiazide interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Bisoprolol, Hydrochlorothiazide interactionBivalirudinAngiomax, Angiomax Rtu, Angiox
How Bivalirudin interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
Read the full Indole-3-carbinol + Bivalirudin interactionBromfenac SodiumBromsite, Prolensa
How Bromfenac Sodium interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
Read the full Indole-3-carbinol + Bromfenac Sodium interactionCabliviCablivi
How Cablivi interacts with Gamma-O — through 1 ingredient. Tap an ingredient for the detail:
Indole-3-carbinolAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
Read the full Indole-3-carbinol + Cablivi interactionCaffeine (otc Drug)Molie, Overtime, Vivarin
How Caffeine (otc Drug) interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Caffeine (otc Drug) interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Caffeine (otc Drug) interactionCaffeine (prescription Drug)Caffeine, Dextrophin
How Caffeine (prescription Drug) interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Caffeine (prescription Drug) interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Caffeine (prescription Drug) interactionCaffeine , Sodium BenzoateCaffeine and Sodium Benzoate
How Caffeine , Sodium Benzoate interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Caffeine , Sodium Benzoate interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Caffeine , Sodium Benzoate interactionCaffeine, Diphenhydramine, Ergotamine (prescription Drug)Ergodryl
How Caffeine, Diphenhydramine, Ergotamine (prescription Drug) interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Caffeine, Diphenhydramine, Ergotamine (prescription Drug) interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Caffeine, Diphenhydramine, Ergotamine (prescription Drug) interactionCaffeine, Ergotamine (prescription Drug)Migergot
How Caffeine, Ergotamine (prescription Drug) interacts with Gamma-O — through 2 ingredients. Tap an ingredient for the detail:
Indole-3-carbinolCytochrome P450 1a2 (cyp1a2) Substrates Moderate
Interaction Summary
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Read the full Indole-3-carbinol + Caffeine, Ergotamine (prescription Drug) interactionVitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Caffeine, Ergotamine (prescription Drug) interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Gamma-O with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.
Vitamin D
Aluminum
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
The protein that transports calcium across the intestinal wall can also bind and transport aluminum. This protein is stimulated by vitamin D, which may therefore increase aluminum absorption. This mechanism may contribute to increased aluminum levels and toxicity in people with renal failure, when they take vitamin D and aluminum-containing phosphate binders chronically.
Atorvastatin (Lipitor)
Vitamin D might reduce absorption of atorvastatin.
A small, low-quality clinical study shows that taking vitamin D reduces levels of atorvastatin and its active metabolites by up to 55%. However, while atorvastatin levels decreased, total cholesterol, low-density lipoprotein (LDL) cholesterol, and high-density lipoprotein (HDL) cholesterol levels did not substantially change. Atorvastatin is metabolized in the gut by CYP3A4 enzymes, and researchers theorized that vitamin D might induce CYP3A4, causing reduced levels of atorvastatin. However, this proposed mechanism was not specifically studied.
Calcipotriene (Dovonex)
Taking calcipotriene with vitamin D increases the risk for hypercalcemia.
Calcipotriene is a vitamin D analog used topically for psoriasis. It can be absorbed in sufficient amounts to cause systemic effects, including hypercalcemia. Theoretically, combining calcipotriene with vitamin D supplements might increase the risk of hypercalcemia.
Digoxin (Lanoxin)
Theoretically, hypercalcemia induced by high-dose vitamin D can increase the risk of arrhythmia from digoxin.
High doses of vitamin D can cause hypercalcemia. Hypercalcemia increases the risk of fatal cardiac arrhythmias with digoxin. Avoid vitamin D doses above the tolerable upper intake level (4000 IU daily for adults) and monitor serum calcium levels in people taking vitamin D and digoxin concurrently.
Diltiazem (Cardizem, Others)
Theoretically, hypercalcemia induced by high-dose vitamin D can reduce the therapeutic effects of diltiazem for arrhythmia.
High doses of vitamin D can cause hypercalcemia. Hypercalcemia can reduce the effectiveness of verapamil in atrial fibrillation. Theoretically this could also occur with diltiazem. Avoid vitamin D doses above the tolerable upper intake level (4000 IU daily for adults) and monitor serum calcium levels in people taking vitamin D and diltiazem concurrently.
Thiazide Diuretics
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Thiazide diuretics decrease urinary calcium excretion, which could lead to hypercalcemia if vitamin D supplements are taken concurrently. This has been reported in people being treated with vitamin D for hypoparathyroidism, and also in elderly people with normal parathyroid function who were taking a thiazide, vitamin D, and calcium-containing antacids daily.
Verapamil (Calan, Others)
Hypercalcemia induced by high-dose vitamin D can reduce the therapeutic effects of verapamil for arrhythmia.
Hypercalcemia due to high doses of vitamin D can reduce the effectiveness of verapamil in atrial fibrillation. Avoid vitamin D doses above the tolerable upper intake level (4000 IU daily for adults) and monitor serum calcium levels in people taking vitamin D and verapamil concurrently.
Cytochrome P450 3A4 (Cyp3A4) Substrates
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
There is some concern that vitamin D might induce CYP3A4. In vitro research suggests that vitamin D induces CYP3A4 transcription. Additionally, observational research has found that increased UV light exposure and serum vitamin D levels are associated with decreased serum levels of CYP3A4 substrates such as tacrolimus and sirolimus, while no association between UV light exposure or vitamin D levels and levels of mycophenolic acid, a non-CYP3A4 substrate, was found. A small, low-quality clinical study shows that taking vitamin D reduces levels of the CYP3A4 substrate atorvastatin and its active metabolites by up to 55%; however, the clinical effects of atorvastatin were not reduced. While researchers theorized that vitamin D might induce CYP3A4, this proposed mechanism was not specifically studied.
Indole-3-Carbinol
Anticoagulant/Antiplatelet Drugs
Theoretically, indole-3-carbinol might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs.
In vitro research shows that indole-3-carbinol inhibits platelet aggregation.
Cytochrome P450 1A2 (Cyp1A2) Substrates
Theoretically, indole-3-carbinol might increase the metabolism of CYP1A2 substrates and lower serum concentrations.
Animal research shows that indole-3-carbinol induces CYP1A2 enzymes.
Estrogens
Indole-3-carbinol might interfere with the effects of estrogen therapy.
Preliminary clinical and in vitro evidence shows that indole-3-carbinol has antiestrogenic activity.
Brand information
Manufacturer and brand details for Gamma-O, from the product label.
Gamma Labs
See all Gamma Labs products- Name
- Gamma Labs
- City
- West Babylon
- State
- NY
- ZipCode
- 11704
- Phone Number
- (877) 426-6262
- Web Address
- www.gammalabs.net
Gamma-O by Gamma Labs: Common Questions
Does Gamma-O by Gamma Labs interact with any medications?
How can one product interact with so many drugs?
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Does this product actually help with cholesterol?
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What side effects might I experience from indole-3-carbinol?
What if I take vitamin D separately — should I still use this product?
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The Full Monographs Behind Gamma-O’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Gamma-oryzanol
Gamma-oryzanol is a mix of plant compounds taken from rice bran oil, used mainly for cholesterol, menopause symptoms, and as a sports supplement. The evidence is limited and mostly comes fro...
Read the full Gamma-oryzanol monograph → Herb & supplement monographVitamin D
Interacts with 715 drugsVitamin D is a fat-soluble vitamin that helps your body absorb calcium and is important for healthy bones, muscles, and immune function. Many people, especially those with low sun exposure,...
Read the full Vitamin D monograph → Herb & supplement monographIndole-3-carbinol
Interacts with 294 drugsIndole-3-carbinol (I3C) is a compound formed when you eat cruciferous vegetables like broccoli and cabbage, and it is sold as a supplement mainly for hormone-related and cell-protective effe...
Read the full Indole-3-carbinol monograph → Herb & supplement monographMaca
Maca is a nutrient-rich Andean root often used for energy, libido, and menopause symptoms. Early studies suggest it may modestly help sexual desire and some menopause symptoms, but the evide...
Read the full Maca monograph →Sources & How We Checked
Gamma-O's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 36 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
Vitamin D 26 references
- McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
- Tatro DS, ed. Drug Interactions Facts. Facts and Comparisons Inc., St. Louis, MO. 1999.
- Koutkia P, Chen TC, Holick MF. Vitamin D intoxication associated with an over-the-counter supplement. N Engl J Med 2001;345:66-7. PubMed
- Bar-Or D, Yoel G. Calcium and calciferol antagonize effect of verapamil in atrial fibrillation. Br Med J 1981;282:1585-6.
- Demontis R, Leflon A, Fournier A, et al. 1 alpha(OH) vitamin D3 increases plasma aluminum in hemodialyzed patients taking AI(OH)3. Clin Nephrol 1986;26:146-9.
- Crowe M, Wollner L, Griffiths RA. Hypercalcemia following vitamin D and thiazide therapy in the elderly. Practitioner 1984;228:312-3.
- Parfitt AM. Thiazide-induced hypercalcemia in vitamin D-treated hypoparathyroidism. Ann Intern Med 1972;77:557-63. PubMed
- Thiazide diuretics and the risk of osteoporosis. Pharmacist's Letter/Prescriber's Letter 2003;19(11):191105.
- Moon J. The role of vitamin D in toxic metal absorption. J Am Coll Nutr 1994;13:559-64.
- Demontis R, Reissi D, Noel C, et al. Indirect clinical evidence that 1alphaOH vitamin D<SUB>3</SUB> increases the intestinal absorption of aluminum. Clin Nephrol 1989;31:123-7.
- Adler AJ, Berlyne GM. Duodenal aluminum absorption in the rat: effect of vitamin D. Am J Physiol 1985;249:G209-13. PubMed
- Schwartz JB. Effects of vitamin D supplementation in atorvastatin-treated patients: A new drug interaction with an unexpected consequence. Clin Pharmacol Ther 2009;85:198-203. PubMed
- Dietary reference intakes for calcium and vitamin D. Institute of Medicine, November 30, 2010. Available at: http://www.iom.edu/~/media/Files/Report%20Files/2010/Dietary-Reference-Intakes-for-Calcium-and-Vitamin-D/Vitamin%20D%20and%20Calcium%202010%20Repo
- Cox KA, Dunn MA. Aluminum toxicity alters the regulation of calbindin-D28k protein and mRNA expression in chick intestine. J Nutr 2001;131:2007-13. PubMed
- Escribano, J., Balaguer, A., Pagone, F., Feliu, A., and Roque, I. Figuls. Pharmacological interventions for preventing complications in idiopathic hypercalciuria. Cochrane.Database.Syst.Rev. 2009;(1):CD004754. PubMed
- Carlton, S., Clopton, D., and Cappuzzo, K. A. Vitamin D deficiency: appropriate replenishment therapies and the effects of vitamin D toxicity. Consult Pharm 2010;25(3):171-177. PubMed
- Wang, H., Xia, N., Yang, Y., and Peng, D. Q. Influence of vitamin D supplementation on plasma lipid profiles: a meta-analysis of randomized controlled trials. Lipids Health Dis. 2012;11:42. PubMed
- Turner AN, Carr Reese P, Fields KS, Anderson J, Ervin M, Davis JA, Fichorova RN, Roberts MW, Klebanoff MA, Jackson RD. A blinded, randomized controlled trial of high-dose vitamin D supplementation to reduce recurrence of bacterial vaginosis. Am J Obstet G PubMed
- Weiner M, Epstein FH. Signs and symptoms of electrolyte disorders. Yale J Biol Med. 1970;43(2):76-109.
- Lappe J, Watson P, Travers-Gustafson D, Recker R, Garland C, Gorham E, Baggerly K, McDonnell SL. Effect of Vitamin D and Calcium Supplementation on Cancer Incidence in Older Women: A Randomized Clinical Trial. JAMA. 2017 Mar 28;317(12):1234-1243. PubMed
- Roth DE, Leung M, Mesfin E, Qamar H, Watterworth J, Papp E. Vitamin D supplementation during pregnancy: state of the evidence from a systematic review of randomised trials. BMJ. 2017;359:j5237. PubMed
- Murai IH, Fernandes AL, Sales LP, et al. Effect of a single high dose of vitamin D3 on hospital length of stay in patients with moderate to severe COVID-19: A randomized clinical trial. JAMA. 2021.
- Wang Z, Schuetz EG, Xu Y, Thummel KE. Interplay between vitamin D and the drug metabolizing enzyme CYP3A4. J Steroid Biochem Mol Biol 2013;136:54-8. PubMed
- Doyle D, Browne U, Brickley A, Murphy D. Vitamin D-induced hypercalcaemia and acute kidney injury in sarcoidosis. BMJ Case Rep 2023;16(1):e250580. PubMed
- Williamson A, Martineau AR, Sheikh A, Jolliffe D, Griffiths CJ. Vitamin D for the management of asthma. Cochrane Database Syst Rev 2023;2(2):CD011511. PubMed
- Kinesya E, Santoso D, Gde Arya N, et al. Vitamin D as adjuvant therapy for diabetic foot ulcers: Systematic review and meta-analysis approach. Clin Nutr ESPEN 2023;54:137-143. PubMed
Indole-3-carbinol 9 references
- Rosen CA, Woodson GE, Thompson JW, et al. Preliminary results of the use of indole-3-carbinol for recurrent respiratory papillomatosis. Otolaryngol Head Neck Surg 1998;118:810-5. PubMed
- Bell MC, Crowley-Nowick P, Bradlow HL, et al. Placebo-controlled trial of indole-3-carbinol in the treatment of CIN. Gynecol Oncol 2000;78:123-9. PubMed
- He YH, Friesen MD, Ruch RJ, Schut HA. Indole-3-carbinol as a chemopreventive agent in 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) carcinogenesis: inhibition of PhIP-DNA adduct formation, acceleration of PhIP metabolism, and induction of cytoch
- Kim, Y. S. and Milner, J. A. Targets for indole-3-carbinol in cancer prevention. J.Nutr.Biochem. 2005;16(2):65-73. PubMed
- Anon. Indole-3-carbinol. Monograph. Alternative Medicine Review 2005;10(4):337-42.
- McAlindon TE, Gulin J, Chen T, et al. Indole-3-carbinol in women with SLE: effect on estrogen metabolism and disease activity. Lupus 2001;10:779-83. PubMed
- Reed GA, Peterson KS, Smith HJ, et al. A phase I study of indole-3-carbinol in women: tolerability and effects. Cancer Epidemiol Biomarkers Prev 2005;14:1953-60. PubMed
- Bradlow HL, Michnovicz JJ, Halper M, et al. Long-term responses of women to indole-3-carbinol or a high fiber diet. Cancer Epidemiol Biomarkers Prev 1994;3:591-5.
- Paliwal P, Chauhan G, Gautam D, Dash D, Patne SCU, Krishnamurthy S. Indole-3-carbinol improves neurobehavioral symptoms in a cerebral ischemic stroke model. Naunyn Schmiedebergs Arch Pharmacol. 2018;391(6):613-625. PubMed
Maca 1 reference
- Valerio, L. G., Jr. and Gonzales, G. F. Toxicological aspects of the South American herbs cat's claw (Uncaria tomentosa) and Maca (Lepidium meyenii) : a critical synopsis. Toxicol.Rev 2005;24(1):11-35. PubMed
Parts of this content are provided by the Therapeutic Research Center, LLC.
DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
© 2021 Therapeutic Research Center, LLC