Major interaction on record — check this product against your medications before combining. Based on 1 of 3 ingredients. Check your meds →
Dietary supplement

K Complete Ingredients & Drug Interactions

by Carlson

K Complete label
See full label image
Softgel Capsule Category: Vitamin
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking K Complete 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

The interaction bottom line Most serious interaction: Major

K Complete is a dietary supplement by Carlson with 3 active ingredients. Its ingredients are commonly taken for supporting normal blood clotting, bone health, heart and vascular health.Based on those ingredients, 2 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Vitamin K2. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against K Complete by Carlson

Ask about any prescription or over-the-counter medication and we check it for interactions with K Complete by Carlson — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of K Complete by Carlson

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.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 3 of its 3 active ingredients.
  • No proprietary blends here — you can verify the dose of every single component.

K Complete has 3 active ingredients: two forms of vitamin K—vitamin K1 and vitamin K2—both working to support clotting and bone health. The rest is inactive ingredients: medium chain triglyceride oil, olive oil, bovine gelatin, glycerin, water, and carob, which form the softgel capsule and help deliver the vitamins.

Does it work?

Strong evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Strong

Clinical evidence supports at least one of this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: Cardiovascular function, bone support, and blood health.
  • We looked for evidence on: Cardiovascular disease (CVD), Hemorrhagic disease, Hypoprothrombinemia, Osteoporosis, Stroke, Vitamin K-dependent clotting factors deficiency (VKCFD) — and 4 related terms.
  • The strongest evidence on file: Vitamin K is rated "Effective" for Hemorrhagic disease (Natural Medicines).
  • Also on file: Vitamin K is rated "Effective" for Hypoprothrombinemia, Warfarin anticoagulation, Vitamin K-dependent clotting factors deficiency (VKCFD).
  • Also on file: Vitamin K is rated "Possibly Effective" for Osteoporosis.

Vitamin K1 and K2 are effective for correcting vitamin K deficiency conditions like hypoprothrombinemia (a clotting disorder), vitamin K–dependent clotting factor deficiency, and hemorrhagic disease. They're also effective at supporting warfarin anticoagulation when taken appropriately under medical supervision.

For osteoporosis, the evidence is less clear—the data shows possibly effective, meaning there's some promise but more research is needed.

The evidence, ingredient by ingredient Vitamin K

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Taken by mouth, vitamin K is generally well tolerated in healthy people at typical dietary and supplement amounts. The most common side effects are mild: diarrhea, nausea, and stomach upset or abdominal pain.

Serious side effects are very rare when taken orally. Vitamin K is rated likely safe in pregnancy and lactation.

The safety notes do recommend checking with your doctor before taking supplements, even though normal dietary amounts are fine.

Side effects, ingredient by ingredient Vitamin K

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Vitamin K.
  • The most serious interaction on file is rated Major.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs.
  • For scale: 2 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your pharmacist if you take warfarin (Coumadin) or any other blood thinner before starting K Complete. Vitamin K can reduce how well these medications work, and your doctor may need to adjust your dose or monitor you more closely.

Check your own medication Run your meds through the checker above

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.

K Complete works well for supporting clotting and bone health if you're not on blood thinners. If you take warfarin, do not start this without talking to your doctor first—the vitamin K will interfere with your medication.

Otherwise, it's generally well tolerated, though mild stomach upset can happen.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 3 of 3 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Sep 25, 2025.

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

At a glance

General information

Key facts about K Complete, straight from the product label.

Brand Carlson
Barcode (UPC) 088395104107
Net contents 45 Softgel(s)
Market status On market
Date entered into DSLD Sep 25, 2025
DSLD ID 337523
Product type Vitamin
Supplement form Softgel Capsule
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Women (not pregnant or lactating), Gluten Free
From the label
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 K Complete by Carlson, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Softgel(s)
Maximum serving Sizes:
1 Softgel(s)
Servings per container
45
UPC/BARCODE
088395104107
IngredientAmount% DV
Vitamin K245 mcg--
Vitamin K1500 mcg417%
Vitamin K21.5 mg--

Other ingredients: Medium Chain Triglyceride Oil, Olive Oil, Bovine Gelatin, Glycerin, Water, Carob

Tap any ingredient to jump to its full detail below.

Label statements
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

K1 & K2 as MK-4 & MK-7

K Complete provides the dynamic trio of vitamin K1, K2 as MK-4, and K2 as MK-7. The MK-7 in this formula is derived from chickpeas.

MenaQ7 Vitamin K2 as MK-7

FDA Statement of Identity

Dietary Supplement

Formulation

Cardiovascular function Bone support Blood health

An FDA Regulated Facility

Gluten-free No artificial preservatives

Potency & quality guaranteed

Suggested/Recommended/Usage/Directions

Directions: Adults: take one soft gel daily at mealtime.

Storage

Keep bottle tightly closed. Store away from heat and moisture.

Precautions

Warning: Vitamin K can antagonize the effect of anticoagulants, including Warfarin. Do not take this product if you are taking Warfarin or are pregnant or breastfeeding without first consulting with your physician.

Brand IP Statement(s)

MenaQ7 is a registered trademark of NattoPharma, Norway. Patents granted and pending.

FDA Disclaimer Statement

These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

K Complete by Carlson label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

K Complete label

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)
What’s inside

The Ingredients in K Complete by Carlson

These are the 3 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 Softgel(s) Dosage formSoftgel Capsule Servings per container45 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 K2

Interacts with
2 drugs
45 mcg per serving Form: Menaquinone-7

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 K2 monograph & interactions

Vitamin K1

Interacts with
2 drugs
500 mcg per serving Form: Phylloquinone

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 K1 monograph & interactions

Vitamin K2

Interacts with
2 drugs
1.5 mg per serving Form: Menatetrenone

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 K2 monograph & interactions

Other (inactive) ingredients: Medium Chain Triglyceride Oil, Olive Oil, Bovine Gelatin, Glycerin, Water, Carob. These complete the product’s ingredient list but are not active constituents.

Interaction report

K Complete by Carlson Drug Interactions

Want to check YOUR meds against K Complete?

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 checker
2Drugs
2 Major

Ingredients driving the most interactions

Vitamin K2 2

Individual Drug Interactions

The ingredients in K Complete interact with 2 drugs. Click any drug to see the details.

1 of the 3 ingredients in K Complete interact with drugs. Each result below shows which ingredient is responsible. Vitamin K2

Each ingredient & the kinds of drugs it affects

For each ingredient in K Complete with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Vitamin K21 drug type · 2 drugs

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.

Likelihood Likely Evidence C
Vitamin K2 full monograph & interactions
The maker

Brand information

Manufacturer and brand details for K Complete, from the product label.

Carlson

See all Carlson products
Name
Carlson Division of J.R. Carlson Laboratories, Inc.
City
Lincolnshire
State
IL
ZipCode
60069
Phone Number
888-234-5656
Web Address
carlsonlabs.com
Pharmacist Counseling Corner

K Complete by Carlson: Common Questions

Does K Complete by Carlson interact with any medications?
Yes. Based on its ingredients, K Complete has a known interaction with 2 medications, including 2 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
K Complete contains 3 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I take K Complete if I'm on warfarin?
No—not without talking to your doctor first. Vitamin K in this product antagonizes warfarin and can reduce its effectiveness at preventing clots. Your prescriber needs to know before you start.
What are the side effects I might feel?
Most common are mild gastrointestinal ones: diarrhea, nausea, abdominal pain, and stomach upset. Serious side effects are very rare when taking it by mouth.
Is it safe to take K Complete while pregnant or breastfeeding?
Yes—vitamin K is rated likely safe in pregnancy and lactation. That said, it's always good to mention any new supplement to your OB or midwife.
Does K Complete actually work for osteoporosis?
The evidence is possibly effective—meaning there's some promise, but researchers still need more data to be sure. It's not a proven treatment on its own.
Why does this product have both K1 and K2?
The product facts don't explain the reason. Both forms support clotting and bone health, so together they may provide broader coverage, but we don't have details on the thinking behind the combination.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if K Complete is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.

K Complete label
Go deeper

The Full Monographs Behind K Complete’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Vitamin K

Interacts with 2 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 supplements are sometimes used for deficiency...

Read the full Vitamin K monograph →
Sources

Sources & How We Checked

K Complete'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.

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 11 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 K 11 references
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
  3. Crowther MA, Ageno W, Garcia D, et al. Oral vitamin K versus placebo to correct excessive anticoagulation in patients receiving warfarin: a randomized trial. Ann Intern Med. 2009;150(5):293-300. PubMed
  4. Dietary vitamin K guidance: an effective strategy for stable control of oral anticoagulation? Nutr Rev. 2010;68(3):178-81. PubMed
  5. Kim JS, Nafziger AN, Gaedigk A, et al. Effects of oral vitamin K on S- and R-warfarin pharmacokinetics and pharmacodynamics: enhanced safety of warfarin as a CYP2C9 probe. J Clin Pharmacol. 2001 Jul;41(7):715-22. PubMed
  6. Riegert-Johnson, D. L. and Volcheck, G. W. The incidence of anaphylaxis following intravenous phytonadione (vitamin K1): a 5-year retrospective review. Ann.Allergy Asthma Immunol. 2002;89(4):400-406. PubMed
  7. Dezee, K. J., Shimeall, W. T., Douglas, K. M., Shumway, N. M., and O'malley, P. G. Treatment of excessive anticoagulation with phytonadione (vitamin K): a meta-analysis. Arch.Intern.Med. 2-27-2006;166(4):391-397. DOI
  8. Dentali, F., Ageno, W., and Crowther, M. Treatment of coumarin-associated coagulopathy: a systematic review and proposed treatment algorithms. J.Thromb.Haemost. 2006;4(9):1853-1863. PubMed
  9. Caluwé R, Vandecasteele S, Van Vlem B, Vermeer C, De Vriese AS. Vitamin K2 supplementation in haemodialysis patients: a randomized dose-finding study. Nephrol Dial Transplant. 2014;29(7):1385-90.
  10. Huang ZB, Wan SL, Lu YJ, Ning L, Liu C, Fan SW. Does vitamin K2 play a role in the prevention and treatment of osteoporosis for postmenopausal women: a meta-analysis of randomized controlled trials. Osteoporos Int. 2015;26(3):1175-86. PubMed
  11. Hunnali CR, Devi U, Kitchanan S, Sethuraman G. Three Different Regimens for Vitamin K Birth Prophylaxis in Infants Born Preterm: A Randomized Clinical Trial. J Pediatr 2023;255:98-104. PubMed

See these in context on the Vitamin K monograph →

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

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