Products · Vitamins & minerals · Core Med Science
Core Med Science Vitamin D3 2,000 IU + K2
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A low-cost D3 + K2 capsule listed in NSF’s Certified for Sport database: 2,000 IU of D3 and 100 mcg of MK-7. A new line from a small brand, with no public batch results; K2 can interfere with warfarin.
Best for People who want D3 and K2 together at a low price, with an independent testing listing behind the label, and who do not take warfarin or other blood thinners.
- Our quality rating
- Good (4 of 5)
- Price range
- Budget
- Verified marks
- NSF Certified for Sport (capsule, 60 count)
- Size
- 60 capsules (60 servings)
- Made in
- Made in the USA (per the maker)
approx. $17 for 60 capsules
See it on Core Med Science’s site →We are not affiliated with Core Med Science. This link goes to the maker’s own page, with no tracking code. How we're funded.
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How we evaluated it
Why we chose it What put it on our list
- NSF’s Certified for Sport database lists “Vitamin D3 & K2 2000 IU 60 ct” (Core Med Science / OIAM Performance): capsule, 60 count, one capsule a serving, lots 23104, 512006 and MW608011. A second listing, “Vitamin D3 & K2” under Core Med Science, shows lot 512006.
- The label is short: vitamin D3 (cholecalciferol) 2,000 IU and vitamin K2 as MK-7 100 mcg, with microcrystalline cellulose, magnesium stearate and silicon dioxide as the only other ingredients.
- 2,000 IU is half the 4,000 IU upper limit for vitamin D, and the K2 is one named form (MK-7) at a stated amount.
- The maker’s price is $16.99 for 60 capsules, about $0.28 a day.
Trade-offs What to weigh before you buy
- Vitamin K2 can interfere with warfarin (Coumadin) and similar blood thinners, and the maker’s page warns about blood thinners too. If you take one, ask your prescriber first, or use a vitamin D3-only product.
- The case for K2 is thin. Our K2 page describes one 3-year trial that used 180 mcg of MK-7 a day, and says protection of the arteries is unproven. This capsule has 100 mcg.
- There are no public batch results. NSF’s listing shows lot numbers, but we found no certificates of analysis on the maker’s site, so heavy-metal results are not available to read.
- It is a young line. The store’s product feed dates this page to July 2026, NSF lists it under two brand names (Core Med Science and OIAM Performance, whose site now says it is moving to Core Med Science), and the page’s marketing copy (fracture risk, mood, energy) goes further than the research we cite. The page also carries a standard California Prop 65 warning, and a June 2026 Prop 65 notice (AG 2026-03039) alleges lead in a different Core Med Science product, its chocolate whey protein.
What to know Details worth knowing first
Vitamin D3 is the form most people supplement, and our supplementation guide covers doses and testing. K2 is the add-on: our K2 page describes a trial in which MK-7 went with less bone loss in postmenopausal women, and notes that its effect on arteries is unproven. This capsule pairs 2,000 IU of D3 with 100 mcg of MK-7.
It is on the list because NSF lists the product and its lots in its Certified for Sport database. NSF checks products against their labels and screens for banned substances, and the database is public, which is more than a maker’s own “third-party tested”. Core Med Science is a small brand and this line is new, so we have less history to go on than with older names.
Two cautions. K2 and blood thinners do not mix without a prescriber’s approval, so people on warfarin should choose D3 on its own. And there are no batch results to read. For what seals can and cannot tell you, see how to tell if a supplement is pure.
Quality & testing How it measures up against our checklist
- Third-party tested
- Yes
- Tested by
- NSF (Certified for Sport)
- Certificate of analysis
- No
| What we checked | What we found |
|---|---|
| Third-party tested Verified | Listed in NSF’s Certified for Sport database twice: “Vitamin D3 & K2 2000 IU 60 ct” (three lots) and “Vitamin D3 & K2” (lot 512006), both capsule, 60 count. The listing shows no certification date or status, and does not state the strength of the second entry. |
| A certificate of analysis Not verified | None on the product page, and we found no certificate library on the site. |
| The right form Maker’s claim | Vitamin D3 as cholecalciferol, 2,000 IU. Vitamin K2 as menaquinone-7 (MK-7), 100 mcg. |
| A plain label Maker’s claim | Two active ingredients, each with an amount. No proprietary blend. |
| Disclosed extras Maker’s claim | Other ingredients: microcrystalline cellulose, magnesium stearate, silicon dioxide. The page gives no allergen statement. |
| Dose against the upper limit Maker’s claim | 2,000 IU against a 4,000 IU upper limit for adults. |
| K2 and blood thinners Maker’s claim | The page warns that vitamin K2 may interact with anticoagulant medicines and advises asking a physician first. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
- Core Med Science Vitamin D3-2000IU + K2 product page. Maker’s page. Price, label amounts, other ingredients and the warning, as seen 2026-10-22. Open ↗
- NSF Certified for Sport listing: Vitamin D3 & K2 2000 IU 60 ct (Core Med Science / OIAM Performance). Certifier or regulator listing. Lots 23104, 512006 and MW608011. Open ↗
- NSF Certified for Sport listing: Vitamin D3 & K2 (Core Med Science). Certifier or regulator listing. Lot 512006. NSF also lists a 5,000 IU D3 + K2 capsule from the same maker (id 1798542); check the strength you buy. Open ↗
- California Attorney General Prop 65 notices naming Core Med Science. Certifier or regulator listing. Searched 2026-10-22. AG 2026-03039, filed 2026-06-26 by the Environmental Research Center, names Core Med Science Whey Protein Chocolate, not this capsule. The database lists one settlement. Open ↗
Alternatives Other options to compare
- Momentous Vitamin D3 2000 IU Vitamin D3 only, so no K2 interaction. NSF listing and public batch certificates; about $20 for 60.
- Thorne Vitamin D + K2 Liquid About $34 for 600 servings of 1,000 IU D3 and 200 mcg of K2 as MK-4. We could not confirm an NSF listing for the liquid, so it is not on our list yet.