MAXIS Vitamin D3 + K2, bottle on a ledge in front of stadium seats

MAXIS Vitamin D3 + K2 Supplement Facts panel, 5,000 IU D3 and 100 mcg K2 MK-7

Vitamin D3 + K2(MK-7)

Name: Vitamin D3 + K2 (MK-7)
Brand: MAXIS
SKU: MAX-9751
Price: 24.0 USD
Availability: InStock

125 mcg (5,000 IU) of vitamin D3 with 100 mcg of vitamin K2 as vitaMK7® menaquinone-7, in one vegetarian capsule a day. Vitamin D supports normal bones and immune function.† Vitamin K contributes to normal bones.†

5,000IUVitamin D3

100MCGVitamin K2 (MK-7)

60Servings

Free shipping on subscriptions and orders over $75 30-day guarantee, even if opened Made in the USA · ships from New Jersey in 1 to 2 business days

Vitamin D3 + K2$21.60 · every 60 days

Choose and add

What to expect

Week by week.

What consistent daily use looks like.

Day 1

One capsule

Take one capsule a day at the same time, whatever is easiest to remember.

Weeks to months

Levels build slowly

Vitamin D levels in the blood change over weeks, and MK-7 builds up because it stays in circulation for days rather than hours.

Ongoing

Check your level

This dose is above the adult upper limit for long-term daily intake. A blood test for 25-hydroxyvitamin D tells you and your doctor whether it is the right amount for you.

The formula

What’s in every serving.

Serving: 1 vegetarian capsule · Count: 60 capsules · When: Once a day · Supply: 60 days

Free from: Dairy, Wheat, Gluten, Eggs, Peanuts, Soy, Tree nuts, Fish, Shellfish, Sesame, Preservatives, Artificial colors, Artificial flavors.

Lab results · lot 2026-31423

Every ingredient we use

Ingredient	Form and source	Per serving	Why it’s here
Vitamin D3	As cholecalciferol 5,000 IU · 625% Daily Value	125 mcg	Vitamin D helps the body absorb calcium and supports normal bones and immune function.† 125 mcg (5,000 IU) is above the 100 mcg (4,000 IU) daily upper limit the National Academies set for adults from all sources, so take this amount with your healthcare provider's input, ideally guided by a blood test.
Vitamin K2	As menaquinone-7 (vitaMK7®) 83% Daily Value	100 mcg	Vitamin K is needed to activate osteocalcin, a bone protein, and the proteins of normal blood clotting.† MK-7 stays in the blood far longer than vitamin K1 and builds up with daily use. FDA's Daily Value for vitamin K is 120 mcg, so this capsule provides 83%. Because MK-7 affects clotting proteins, anyone on warfarin should talk to their doctor first.

Other ingredients: Organic Rice Hull Extract, Vegetarian Capsule.

The research

What the studies found.

Why MK-7

Researchers compared synthetic vitamin K1 with MK-7 from natto in healthy volunteers. MK-7 had a much longer half-life, gave more stable blood levels and built up 7 to 8 times higher with daily intake, and it activated osteocalcin more completely. The authors also warned that 50 mcg a day or more of MK-7 may meaningfully interfere with oral anticoagulants.†

Schurgers LJ, Teunissen KJF, Hamulyak K, Knapen MHJ, Vik H, Vermeer C. Vitamin K-containing dietary supplements: comparison of synthetic vitamin K1 and natto-derived menaquinone-7. Blood. 2007;109(8):3279–3283.

Vitamin D when levels are adequate

In VITAL, a large randomized trial of generally healthy midlife and older adults who were not selected for low vitamin D, vitamin D supplements did not change bone outcomes compared with placebo. Vitamin D still matters for normal bones;† the trial suggests extra vitamin D adds nothing for people who already have enough.†

LeBoff MS, Chou SH, Ratliff KA, et al. N Engl J Med. 2022;387(4):299–309.

Studies of the ingredients, not of the finished product. Results vary from person to person.

How to take it

1 capsule daily

See the full protocol

Adults: take one vegetarian capsule a day, or as directed by a healthcare professional. If you take warfarin or another vitamin K antagonist, talk to your doctor before use. This capsule provides 5,000 IU of vitamin D, which is above the 4,000 IU daily upper limit for adults, so check with your healthcare provider about your vitamin D level and any other vitamin D you take. Store in a cool, dry place away from direct light.

Who should skip it or ask a doctor first

Anyone on warfarin or another vitamin K antagonist, without their doctor's approval
Anyone already taking another vitamin D supplement, without checking the total
Children; this is an adult dose
Vegans who avoid animal-derived vitamin D3; check the source with us first

Warnings

If you take a vitamin K antagonist such as warfarin, consult your doctor before use. Vitamin K can change how these medications work. Provides 125 mcg (5,000 IU) of vitamin D, above the 100 mcg (4,000 IU) daily upper limit for adults. Count any other vitamin D you take and ask your healthcare provider about testing your level. If you are pregnant or nursing, take medication (including statins, steroids, thiazide diuretics or orlistat), or have a medical condition, consult a healthcare professional before use. Stop taking it and talk to a healthcare professional if you notice any adverse reaction. Keep out of reach of children.

In his words

Why Kevin takes it.

Kevin Matthews, MAXIS co-founder and NCAA regional champion, on Vitamin D3 + K2.

Reviews

No reviews of this one yet.

4.95 average across 21 MAXIS reviews. Read them.

Questions

Questions, answered.

Is 5,000 IU too much?

It is above the 4,000 IU (100 mcg) daily upper limit the National Academies set for adults, the highest daily intake considered unlikely to cause harm for almost everyone. Some people need more under medical supervision, usually after a blood test shows a low level. Ask your healthcare provider to check your 25-hydroxyvitamin D and count any vitamin D from other supplements.

Why take D3 and K2 together?

Vitamin D helps you absorb calcium, and vitamin K activates osteocalcin, a protein that binds calcium in bone.† Taking them together covers both in one capsule.

Why MK-7 instead of K1?

MK-7 stays in the blood for days rather than hours, so daily doses build up to steadier levels. In a comparison study, MK-7 also activated osteocalcin more completely than K1.

I take warfarin. Can I use this?

Only with your doctor's approval. Vitamin K affects how warfarin works, and studies suggest 50 mcg a day or more of MK-7 can make a meaningful difference. This capsule has 100 mcg.

Should I take it with food?

The label does not specify, so take it whenever you will remember it each day.

Is it vegan?

The capsule is vegetarian. The label does not say vegan, and vitamin D3 is often made from lanolin from sheep's wool, so ask us before buying if you avoid all animal-derived ingredients.

Does more vitamin D mean better results?

Not if you already have enough. In the large VITAL trial, vitamin D supplements did not change bone outcomes in generally healthy adults who were not low in vitamin D. Vitamin D supports normal bones;† a blood test tells you whether you need more.

Where and how is it made?

In the USA, with globally sourced ingredients, in an NPA GMP-certified, third-party audited, FDA-registered facility that follows FDA's cGMP rules for dietary supplements (21 CFR Part 111).

Can I take it with other MAXIS products?

Yes. It pairs with Ultra Omega-3, Creatine and Clear Fiber, which contain no vitamin D or K. Count any vitamin D from a multivitamin or other supplement.

Who should check with a doctor first?

Anyone pregnant or nursing, taking warfarin or another vitamin K antagonist, statins, steroids, thiazide diuretics or orlistat, or managing a medical condition.

Can I use it if I compete in a tested sport?

This product does not carry a banned-substance certification such as NSF Certified for Sport or Informed Sport. If you compete under anti-doping rules, check with your governing body before using any supplement.

Daily foundations

Ultra Omega-3

970 mg EPA and DHA in two mini softgels.†

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Details

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