NKC Immune Boost Ingredients & Drug Interactions
by Sylvan Bio
What is this page for?
First and foremost: checking NKC Immune Boost 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
NKC Immune Boost is a dietary supplement by Sylvan Bio with 2 active ingredients. Its ingredients are commonly taken for immune support, general wellness and antioxidant, adjunct interest during cancer care.Based on those ingredients, 795 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Vitamin D, Agaricus blazei. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
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HelloPharmacist Scorecard of NKC Immune Boost by Sylvan Bio
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
NKC Immune Boost contains two active ingredients: agaricus mushroom (also called Agaricus blazei) and vitamin D. The product also includes inactive ingredients—the mushroom powder itself and gelatin capsules.
Agaricus mushroom is a medicinal fungus, and vitamin D is a fat-soluble vitamin your body needs for calcium absorption and immune function. Both are included to support immune health, though the evidence for agaricus mushroom's specific benefits is still being established.
Does it work?
Not established
Vitamin D is effective for treating rickets, osteomalacia (soft bones), renal bone disease, familial hypophosphatemia, and hypoparathyroidism. For agaricus mushroom, the evidence isn't yet established in our data.
Clinical trials have looked at its potential role in hay fever, osteoporosis, cancer, heart disease, chemotherapy side effects, and Crohn's disease, but none of these uses have sufficient reliable evidence to rate as proven.
How safe is it?
Well-documented data
Vitamin D is generally well tolerated at recommended doses, but very high doses over time can cause toxicity with symptoms of high calcium levels (hypercalcemia). Agaricus mushroom is generally well tolerated as a food, though the safety and long-term effects of supplement doses aren't well established.
The most common side effects from agaricus mushroom are abdominal discomfort, diarrhea, and nausea. Rare but serious side effects include allergic reactions, liver damage, and lung inflammation (interstitial lung disease).
Three cases of severe liver damage have been reported in women with ovarian or breast cancer receiving chemotherapy who also took agaricus mushroom. For pregnancy: vitamin D is likely safe at recommended amounts, though you should use it only under your doctor's guidance.
Agaricus mushroom has insufficient safety data, so it's best to avoid supplement doses during pregnancy. For breastfeeding: vitamin D is generally considered acceptable at recommended doses, but check with your doctor before taking higher amounts.
Agaricus mushroom also lacks sufficient safety data for breastfeeding, so avoid it during this time.
Meds to double-check
Moderate interaction found
Before taking this product, double-check with your doctor or pharmacist if you take blood sugar medications (agaricus mushroom may increase low blood sugar risk), heart rhythm medications like verapamil, diltiazem, or digoxin (vitamin D can interfere with how well they work or raise calcium dangerously), thiazide diuretics or water pills (vitamin D may raise calcium too high), cholesterol drugs like atorvastatin (vitamin D may reduce absorption), or calcipotriene for psoriasis (combined use increases calcium risk). Vitamin D may also affect how your body breaks down many other medications.
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.
This product combines a mushroom with potential immune benefits (though the evidence is still being studied) with vitamin D, which has proven roles in bone and mineral health. If you take any medications—especially blood sugar drugs, heart medications, cholesterol drugs, or water pills—check your exact list with the search tool on this page before starting.
Talk it over with your doctor or pharmacist to make sure it's right for you and won't interfere with your other treatments.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 2 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Jul 27, 2021.
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 NKC Immune Boost, straight from the product label.
| Brand | Sylvan Bio |
|---|---|
| Barcode (UPC) | 813892006018 |
| Net contents | 120 Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Jul 27, 2021 |
| DSLD ID | 249769 |
| Product type | Other Combinations |
| Supplement form | Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Women (not pregnant or lactating) |
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 NKC Immune Boost by Sylvan Bio, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Agaricus blazei | 1000 mg | -- |
| Vitamin D | 1000 IU | 125% |
Other ingredients: organic Agaricus blazei Mushrooms, Gelatin Capsules
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.
Formula
NKC Immune Boost contains powdered Agaricus blazei mushrooms (ABM) naturally enhanced with vitamin D. ABM stimulates the body's immune system by triggering an increase in the production of Natural Killer Cells (NKC). These cells are the body's first line of defense against infection by working to recognize and destroy viruses and other microbes. The vitamin D in NKC immune boost has been demonstrated to support the body's natural defense against infection. With the unique combination of bioactive compounds in agaricus blazei, NKC immune boost assists the body in building and maintaining a strong immune system.
Organic agaricus blazei mushroom powder
General Statements
Find out more at www.sylvanwellness.com
Sylvan Bio Sylvan Wellness
Suggested/Recommended/Usage/Directions
Directions for use: Take 2 capsules 2 times per day (morning and evening) with water at mealtimes. Do not take more than 4 capsules in a 24 hour period.
Precautions
Keep out of reach of children.
As with any dietary supplement, consult a physician if you are taking any prescription.
Warning: Do not use if you are pregnant, can become pregnant, or are nursing; have undergone an organ transplant or major surgery within the past six weeks; have active liver disease or history of liver disease; are allergic to mushrooms or mushroom products.
Warning: Do not use if you are pregnant, can become pregnant, or are nursing; have undergone an organ transplant or major surgery within the past six weeks; have active liver disease or history of liver disease; are allergic to mushrooms or mushroom products.
Do not use if freshness seals are damaged or missing.
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cur or prevent any disease.
FDA Statement of Identity
Dietary Supplement
Formulation
The natural way to enhance immune function
Produced and bottled in the USA
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
NKC Immune Boost by Sylvan Bio 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 NKC Immune Boost by Sylvan Bio
These are the 2 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.
Agaricus blazei
Interacts with86 drugs
Agaricus mushroom (often Agaricus blazei/subrufescens) is a culinary and medicinal mushroom studied mostly for possible immune and antioxidant effects...
Agaricus blazei 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 & interactionsOther (inactive) ingredients: Organic Agaricus blazei Mushrooms, Gelatin Capsules. These complete the product’s ingredient list but are not active constituents.
NKC Immune Boost by Sylvan Bio Drug Interactions
HelloPharmacist Interaction Report
NKC Immune Boost by Sylvan Bio contains agaricus mushroom and vitamin D, and together these ingredients interact with a substantial number of medications.
The most serious interaction involves agaricus mushroom with antidiabetes drugs (blood sugar medications), where there's a moderate risk of low blood sugar (hypoglycemia)—a clinical study found that some patients on these drugs experienced low blood sugar when also taking agaricus mushroom extract.
Read the full breakdown — every affected drug type, severity by severity
Vitamin D carries moderate-severity interactions with several heart and blood pressure medications. It can reduce how well verapamil and diltiazem work for irregular heartbeat, and theoretically increase the risk of dangerous heart rhythms when combined with digoxin.
High-dose vitamin D may also increase calcium levels dangerously when paired with thiazide diuretics (water pills) or calcipotriene (a psoriasis drug). Additionally, vitamin D might reduce how well atorvastatin (a cholesterol drug) is absorbed, and it may theoretically increase aluminum absorption in people with kidney disease.
Vitamin D also carries a minor interaction with a broad category of medications broken down by the liver (CYP3A4 substrates), potentially reducing their effectiveness. Altogether, these interactions span 796 individual medications.
Check your exact medications with the search tool on this page before starting NKC Immune Boost.
Check your own medications below · Editorial policy · How we use AI
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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 NKC Immune Boost interact with 795 drugs. Click any drug to see the details.
2 of the 2 ingredients in NKC Immune Boost interact with drugs. Each result below shows which ingredient is responsible. Vitamin D Agaricus blazei
AcarboseGlucobay, Prandase, Precose
How Acarbose interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Agaricus BlazeiAntidiabetes Drugs Moderate
Interaction Summary
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Read the full Agaricus Blazei + Acarbose interactionAcetohexamideDymelor
How Acetohexamide interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Agaricus BlazeiAntidiabetes Drugs Moderate
Interaction Summary
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Read the full Agaricus Blazei + Acetohexamide interactionAlbiglutideTanzeum
How Albiglutide interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Agaricus BlazeiAntidiabetes Drugs Moderate
Interaction Summary
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Read the full Agaricus Blazei + Albiglutide interactionAlginic Acid, Aluminum HydroxideRafton
How Alginic Acid, Aluminum Hydroxide interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Alginic Acid, Aluminum Hydroxide interactionAlogliptinNesina
How Alogliptin interacts with NKC Immune Boost — through 2 ingredients. Tap an ingredient for the detail:
Agaricus BlazeiAntidiabetes Drugs Moderate
Interaction Summary
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Read the full Agaricus Blazei + Alogliptin 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 + Alogliptin interactionAlogliptin, MetforminKazano
How Alogliptin, Metformin interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Agaricus BlazeiAntidiabetes Drugs Moderate
Interaction Summary
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Read the full Agaricus Blazei + Alogliptin, Metformin interactionAlogliptin, PioglitazoneOseni
How Alogliptin, Pioglitazone interacts with NKC Immune Boost — through 2 ingredients. Tap an ingredient for the detail:
Agaricus BlazeiAntidiabetes Drugs Moderate
Interaction Summary
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Read the full Agaricus Blazei + Alogliptin, Pioglitazone 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 + Alogliptin, Pioglitazone interactionAluminum Acetate, Benzethonium ChlorideBuro-Sol Otic Solution
How Aluminum Acetate, Benzethonium Chloride interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum Acetate, Benzethonium Chloride interactionAluminum ChlorideAluminum Chloride, Anhydrol Forte, Driclor, Drysol
How Aluminum Chloride interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum Chloride interactionAluminum HydroxideAlu-Cap, Amphojel, Gaviscon
How Aluminum Hydroxide interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum Hydroxide interactionAluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium HydroxideAscriptin Codeine #2
How Aluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium Hydroxide interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium Hydroxide interactionAluminum Hydroxide, Aspirin, Magnesium HydroxideAscriptin
How Aluminum Hydroxide, Aspirin, Magnesium Hydroxide interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum Hydroxide, Aspirin, Magnesium Hydroxide interactionAluminum Hydroxide, Magnesium Hydroxide (otc Drug)Maalox, Mucogel
How Aluminum Hydroxide, Magnesium Hydroxide (otc Drug) interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum Hydroxide, Magnesium Hydroxide (otc Drug) interactionAluminum Hydroxide, Magnesium Hydroxide, Simethicone (otc Drug)Mylanta
How Aluminum Hydroxide, Magnesium Hydroxide, Simethicone (otc Drug) interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum Hydroxide, Magnesium Hydroxide, Simethicone (otc Drug) interactionAluminum, CalciumDomeboro
How Aluminum, Calcium interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum, Calcium interactionAluminum, Magnesium (otc Drug)Almagel
How Aluminum, Magnesium (otc Drug) interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum, Magnesium (otc Drug) interactionAluminum, Magnesium Hydroxide (otc Drug)Wingel
How Aluminum, Magnesium Hydroxide (otc Drug) interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aluminum, Magnesium Hydroxide (otc Drug) interactionAmiloride, HydrochlorothiazideAmil-Co, Amilzide, Moduret 25, Moduretic
How Amiloride, Hydrochlorothiazide interacts with NKC Immune Boost — 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 + Amiloride, Hydrochlorothiazide interactionAntidiabetes, Dipeptidyl Peptidase-4 (dpp-iv) InhibitorGlyxambi
How Antidiabetes, Dipeptidyl Peptidase-4 (dpp-iv) Inhibitor interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Agaricus BlazeiAntidiabetes Drugs Moderate
Interaction Summary
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Read the full Agaricus Blazei + Antidiabetes, Dipeptidyl Peptidase-4 (dpp-iv) Inhibitor interactionAspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium HydroxideAscriptin Codeine #3
How Aspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium Hydroxide interacts with NKC Immune Boost — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DAluminum Moderate
Interaction Summary
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
Read the full Vitamin D + Aspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium Hydroxide interactionAtenolol, ChlortalidoneAtenixCo, Tenoret 50, Totaretic
How Atenolol, Chlortalidone interacts with NKC Immune Boost — 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 NKC Immune Boost — 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 NKC Immune Boost — 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 NKC Immune Boost — 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 NKC Immune Boost — 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 interactionBenazepril, HydrochlorothiazideLotensin HCT
How Benazepril, Hydrochlorothiazide interacts with NKC Immune Boost — 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 interactionBendroflumethiazideAprinox, Naturetin, Neo-NaClex
How Bendroflumethiazide interacts with NKC Immune Boost — 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 NKC Immune Boost — 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 NKC Immune Boost — 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 NKC Immune Boost — 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 interactionEach ingredient & the kinds of drugs it affects
For each ingredient in NKC Immune Boost 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.
Agaricus blazei
Antidiabetes Drugs
Theoretically, taking agaricus mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
In one clinical study in patients with type 2 diabetes who are stabilized on conventional oral hypoglycemic agents, 3 of 29 patients taking an agaricus mushroom extract 500 mg three times daily for 12 weeks reported hypoglycemia, compared to one of 29 patients in the placebo group.
Brand information
Manufacturer and brand details for NKC Immune Boost, from the product label.
Sylvan Bio
See all Sylvan Bio products- Name
- Sylvan Bio, Inc.
- Street Address
- 198 Nolte Drive
- City
- Kittanning
- State
- PA
- ZipCode
- 16201
- Phone Number
- 1-866-352-7520
NKC Immune Boost by Sylvan Bio: Common Questions
Does NKC Immune Boost by Sylvan Bio interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
What is agaricus mushroom, and why is it in this product?
Can I take this if I'm pregnant or breastfeeding?
What side effects might I get from agaricus mushroom?
Is vitamin D safe to take long-term?
Can high-dose vitamin D cause problems?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if NKC Immune Boost is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.
The Full Monographs Behind NKC Immune Boost’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Agaricus Mushroom
Interacts with 86 drugsAgaricus mushroom (often Agaricus blazei/subrufescens) is a culinary and medicinal mushroom studied mostly for possible immune and antioxidant effects. The human evidence is limited and not...
Read the full Agaricus Mushroom 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 →Sources & How We Checked
NKC Immune Boost'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 31 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.
Agaricus Mushroom 5 references
- Hsu CH, Liao YL, Lin SC, et al. The mushroom Agaricus Blazei Murill in combination with metformin and gliclazide improves insulin resistance in type 2 diabetes: a randomized, double-blinded, and placebo-controlled clinical trial. J Altern Complement Med 2
- Mukai H, Watanabe T, Ando M, Katsumata N. An alternative medicine, Agaricus blazei, may have induced severe hepatic dysfunction in cancer patients. Jpn J Clin Oncol 2006;36:808-10. PubMed
- Ohno S, Sumiyoshi Y, Hashine K, et al. Phase I clinical study of the dietary supplement, Agaricus blazei Murill, in cancer patients in remission. Evid Based Complement Alternat Med 2011, doi 10.1155/2011/192381.
- Suehiro M, Katoh N, Kishimoto S. Chelitis due to Agaricus blazei Murill mushroom extract. Contact Dermatitis 2007;56(5):293-4.
- Iwai N, Okuda T, Sawada R, et al. Interstitial lung disease associated with Agaricus blazei Murill in a patient with pancreatic ductal adenocarcinoma receiving gemcitabine-based therapy. Case Rep Gastroenterol 2022;16(1):229-234.
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
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.
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