Vitamins D + K Ingredients & Drug Interactions
What is this page for?
First and foremost: checking Vitamins D + K 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
Vitamins D + K is a dietary supplement by EXOS Performance Nutrition with 2 active ingredients. Its ingredients are commonly taken for bone health and osteoporosis, correcting vitamin d deficiency, immune system support.Based on those ingredients, 715 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Vitamin D, Vitamin K. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Vitamins D + K by EXOS Performance Nutrition
Ask about any prescription or over-the-counter medication and we check it for interactions with Vitamins D + K by EXOS Performance Nutrition — 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 Vitamins D + K by EXOS Performance Nutrition
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
This product contains 2 active ingredients: vitamin D and vitamin K. The liquid form also includes medium chain triglyceride oil and mixed tocopherols (a form of vitamin E) as inactive ingredients to help with absorption and shelf stability.
Vitamin D is a hormone-like nutrient your body uses to absorb calcium and keep your immune system and bones strong. Vitamin K helps your blood clot and supports bone health.
Together, they're often used to address deficiencies or bone and clotting disorders.
Does it work?
Strong evidence
Vitamin D is effective for rickets, osteomalacia (soft bones from vitamin D deficiency), familial hypophosphatemia, renal bone disease, and hypoparathyroidism. Vitamin K is effective for vitamin K deficiency, clotting factor problems, and warfarin-related bleeding — and it's possibly effective for osteoporosis.
The evidence base for their combined use in this liquid form isn't detailed in our data.
How safe is it?
Well-documented data
Both vitamins are generally well tolerated at recommended doses. Vitamin D can cause toxicity if you take very high doses over time, with symptoms including high blood calcium (hypercalcemia), bone loss in adults, and slowed growth in children.
Vitamin K taken by mouth most commonly causes mild stomach upset, nausea, diarrhea, or abdominal pain — these are usually minor. Safety data on this product during pregnancy and breastfeeding is not on file; the general safety notes suggest vitamin D is used during pregnancy only under doctor guidance and vitamin K at normal dietary amounts is likely safe in pregnancy, but you'll want to discuss supplementation with your doctor before starting.
Meds to double-check
Major interaction found
Check with your pharmacist before using this product if you take warfarin or other blood thinners — vitamin K blocks their effects. Also double-check if you're on digoxin, verapamil, diltiazem, or other heart rhythm medications, thiazide diuretics (water pills), atorvastatin or other statins, calcipotriene for psoriasis, or any medications broken down by the CYP3A4 liver enzyme.
Vitamin D at high doses can raise blood calcium and interfere with these drugs' effectiveness or safety.
The bottom line
Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Major medication interactions have been identified, and safety information is well characterized.
This product is appropriate for people needing vitamin D or K supplementation who don't take warfarin, high-dose heart medications, thiazide diuretics, statins, or digoxin. If you're on any prescription medication — especially for the heart, blood clotting, cholesterol, or blood pressure — talk to your pharmacist before adding it.
At recommended doses, both vitamins are generally well tolerated, though vitamin D toxicity is a risk with very high long-term intake.
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 Sep 25, 2015.
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 Vitamins D + K, straight from the product label.
| Brand | EXOS Performance Nutrition |
|---|---|
| Barcode (UPC) | 693749005445 |
| Net contents | 1 fl. Oz.; 30 mL |
| Market status | On market |
| Date entered into DSLD | Sep 25, 2015 |
| DSLD ID | 50249 |
| Product type | Vitamin |
| Supplement form | Liquid |
| Dietary claims / uses | Nutrient, All Other |
| Intended target group(s) | Adult (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 Vitamins D + K by EXOS Performance Nutrition, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Vitamin D | 1000 IU | 250% |
| Vitamin K | 200 mcg | 250% |
Other ingredients: Medium Chain Triglyceride Oil, Mixed Tocopherols
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.
Suggested/Recommended/Usage/Directions
Suggested Use: Take 2 drops one to three times daily or as recommended by your health-care or performance professional.
General Statements
Powered by Thorne Research Performance nutrition
FOUNDATION
Daily Value (DV)
FDA Statement of Identity
Dietary Supplement
Formula
VITAMINS D + K
General
EXOS500 LEXOS50002
Seals/Symbols
Pn Precision Nutrition approved
Precautions
If pregnant, consult your health-care practitioner before using this product.
Tamper evident: Use only if bottle is sealed.
Storage
Store tightly sealed in a cool, dry place.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Vitamins D + K by EXOS Performance Nutrition 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 Vitamins D + K by EXOS Performance Nutrition
These are the 2 active ingredients this product is made of. Select any to open its full monograph.
Serving size2 Drop(s) Dosage formLiquid Servings per container600 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.
Vitamin 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 & interactionsVitamin K
Interacts with2 drugs
Vitamin K is an essential nutrient your body needs for normal blood clotting and to support healthy bones. Most people get enough from food, but suppl...
Vitamin K monograph & interactionsOther (inactive) ingredients: Medium Chain Triglyceride Oil, Mixed Tocopherols. These complete the product’s ingredient list but are not active constituents.
Vitamins D + K by EXOS Performance Nutrition Drug Interactions
HelloPharmacist Interaction Report
EXOS Performance Nutrition's Vitamins D + K product carries documented interactions with multiple medications across both ingredients.
Vitamin K has a major interaction with warfarin (Coumadin) — vitamin K directly reverses warfarin's blood-thinning effects, and extra vitamin K from supplements or dietary changes can significantly reduce how well the drug works.
Read the full breakdown — every affected drug type, severity by severity
Vitamin D interacts moderately with several medication types. Thiazide diuretics (water pills), verapamil, diltiazem, and digoxin all carry moderate concerns tied to high-dose vitamin D raising blood calcium levels (hypercalcemia), which can either increase the risk of dangerous heart rhythms or reduce the drug's effectiveness.
Vitamin D may also reduce absorption of atorvastatin (a statin for cholesterol), and theoretically it can boost aluminum absorption in people with kidney problems and induce liver enzymes that speed up the breakdown of certain other drugs (CYP3A4 substrates). Calcipotriene, a vitamin D-like psoriasis medication, compounds the risk of high blood calcium if used alongside vitamin D supplements.
Altogether, these interactions span 705 individual medications. If you take any prescription medication — especially blood thinners, heart drugs, cholesterol pills, or diuretics — run it through the checker below before starting this product.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Vitamins D + K?
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 Vitamins D + K interact with 715 drugs. Click any drug to see the details.
2 of the 2 ingredients in Vitamins D + K interact with drugs. Each result below shows which ingredient is responsible. Vitamin D Vitamin K
WarfarinWarfarin
How Warfarin interacts with Vitamins D + K — through 2 ingredients. Tap an ingredient for the detail:
Vitamin KWarfarin (coumadin) Major
Interaction Summary
Vitamin K can antagonize and reverse the therapeutic effects of warfarin.
Read the full Vitamin K + Warfarin 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 + Warfarin interactionWarfarin SodiumCoumadin, Panwarfin, Sofarin
How Warfarin Sodium interacts with Vitamins D + K — through 2 ingredients. Tap an ingredient for the detail:
Vitamin KWarfarin (coumadin) Major
Interaction Summary
Vitamin K can antagonize and reverse the therapeutic effects of warfarin.
Read the full Vitamin K + Warfarin Sodium 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 + Warfarin Sodium interactionAlginic Acid, Aluminum HydroxideRafton
How Alginic Acid, Aluminum Hydroxide interacts with Vitamins D + K — 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 interactionAluminum Acetate, Benzethonium ChlorideBuro-Sol Otic Solution
How Aluminum Acetate, Benzethonium Chloride interacts with Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 interactionAspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium HydroxideAscriptin Codeine #3
How Aspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium Hydroxide interacts with Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 Vitamins D + K — 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 interactionBenzthiazideExna
How Benzthiazide interacts with Vitamins D + K — 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 Vitamins D + K — 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 interactionBisoprolol, HydrochlorothiazideZiac
How Bisoprolol, Hydrochlorothiazide interacts with Vitamins D + K — 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 interactionCalcipotrieneDovonex
How Calcipotriene interacts with Vitamins D + K — 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 + Calcipotriene interactionCandesartan Cilexetil, HydrochlorothiazideAtacand HCT
How Candesartan Cilexetil, Hydrochlorothiazide interacts with Vitamins D + K — 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 + Candesartan Cilexetil, Hydrochlorothiazide interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Vitamins D + K 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.
Vitamin K
Warfarin (Coumadin)
Vitamin K can antagonize and reverse the therapeutic effects of warfarin.
Vitamin K antagonizes the effects of warfarin. Excessive vitamin K intake, either from supplements or from changes in the diet, can reduce the anticoagulant effect of warfarin.
Brand information
Manufacturer and brand details for Vitamins D + K, from the product label.
EXOS Performance Nutrition
See all EXOS Performance Nutrition products- Name
- Thorne Research, Inc.
- Street Address
- P.O. BOX 25
- City
- Dover
- State
- ID
- ZipCode
- 83825
- Phone Number
- 1-800-228-1966
Vitamins D + K by EXOS Performance Nutrition: Common Questions
Does Vitamins D + K by EXOS Performance Nutrition interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Can I take this if I'm on warfarin or another blood thinner?
What are the most common side effects?
Is this safe to take during pregnancy?
What is vitamin D actually for?
What does vitamin K do?
Can vitamin D affect how my other medications work?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Vitamins D + K 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 Vitamins D + K’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Vitamin 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 monographVitamin K
Interacts with 2 drugsVitamin K is an essential nutrient your body needs for normal blood clotting and to support healthy bones. Most people get enough from food, but supplements are sometimes used for deficiency...
Read the full Vitamin K monograph →Sources & How We Checked
Vitamins D + K'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 37 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
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