Vitamins & minerals
Vitamins and minerals checked by an outside tester, in forms and doses the research supports.
What we look for
We look for
- Third-party tested: NSF Certified for Sport, NSF Contents Certified, USP Verified, Informed Choice or Informed Sport, with the exact product in the certifier’s own database.
- A certificate of analysis: batch results you can read, ideally including heavy metals.
- The right form: one the research supports (magnesium glycinate or bisglycinate rather than oxide, for example), at a matching dose.
- A plain label: every ingredient and amount listed, with no proprietary blends.
- Disclosed extras: sweeteners, fillers and allergens named.
We avoid
- Proprietary blends that hide amounts.
- Doses above the tolerable upper intake level without a reason, such as vitamin D over 4,000 IU, zinc over 40 mg or supplemental magnesium over 350 mg a day.
- Seals the maker gives itself (“lab tested”, “GMP quality”) with no named testing organization.
- Cure, detox or “boosts everything” claims.
- Vitamin K products with no warning for people who take warfarin.
Read the research
Know one that fits? Suggest a product
13 products · best rated first
-
Core Med ScienceCore Med Science Vitamin D3 2,000 IU + K2
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. NSF Certified for Sport (capsule, 60 count) -
MomentousMomentous Magnesium Bisglycinate
A magnesium bisglycinate capsule (200 mg per two) listed in NSF’s Certified for Sport database, with batch certificates online. It costs about two thirds of Thorne’s powder per serving. As a new product it has only two certificates posted. NSF Certified for Sport -
MomentousMomentous Vitamin D3 2000 IU
A plain vitamin D3 capsule (2,000 IU) listed in NSF’s Certified for Sport database, with a maker-posted certificate for each listed lot. The certificates show more than the label dose, and it costs more than store-brand D3. NSF Certified for Sport (capsule, 60 count) -
MomentousMomentous Zinc Picolinate 15 mg
A 15 mg zinc picolinate capsule listed in NSF’s Certified for Sport database, with lot certificates online. The dose sits at the low end of the usual range, well under the 40 mg upper limit. NSF Certified for Sport (listed as “Zinc”, Momentous, capsule, 60 count) -
ThorneThorne Basic Nutrients 2/Day
A two-capsule multivitamin with every amount on the label and no iron, listed in NSF’s Certified for Sport database. It has vitamin K (a warfarin issue) and 80 mg of niacinamide, over a US limit set for flushing. No batch results. NSF Certified for Sport (capsule, 60 count) -
ThorneThorne Iron Bisglycinate 25 mg
A single-ingredient iron bisglycinate capsule (25 mg) listed in NSF’s Certified for Sport database. Iron is for confirmed low iron only, because excess is hard to excrete and a child’s overdose can be fatal. NSF Certified for Sport (capsules, 60 count) -
ThorneThorne Magnesium Bisglycinate
A chelated magnesium (bisglycinate) powder listed in NSF’s Certified for Sport database, so an outside tester checks the label. It costs more than basic forms, and the page shows no batch certificate. NSF Certified for Sport -
ThorneThorne Vitamin B12 (Methylcobalamin) 1 mg
A single-ingredient B12 capsule (1,000 mcg as methylcobalamin) listed in NSF’s Certified for Sport database. The dose sits at the low end of the range our guide cites for low B12, and no batch results are public. NSF Certified for Sport (capsule, 60 and 90 count) -
Kirkland Signature (Costco)Kirkland Signature Extra Strength D3 50 mcg (2,000 IU)
Costco’s house-brand vitamin D3 (2,000 IU) at about 2 cents a day, with the USP Verified mark on its label and Costco’s page. USP’s database refused our automated check, so we have not confirmed the listing. -
MomentousMomentous Essential Multivitamin
A four-capsule multivitamin listed in NSF’s Certified for Sport database, with lot certificates online. Its page text leaves out the 50 mcg of K2 that its label image and certificates show, which matters on warfarin. NSF Certified for Sport (capsule, 120 count) -
Nature MadeNature Made Vitamin D3 2000 IU (50 mcg) Softgels
A plain 2,000 IU vitamin D3 softgel at a low price, with the USP Verified mark on its label and page. USP’s database refused our automated check, so we have not confirmed the listing. -
Pillar PerformancePillar Performance Triple Magnesium Tablets
A three-form magnesium tablet (310 mg per two) that Informed Sport has listed since June 2022. The label does not say how much each form contributes, and we have not seen a current batch certificate for a US jar. Informed Sport (tablet, certified 14 June 2022 in its listing) -
ThorneThorne Vitamin D + K2 Liquid
A liquid D3 + K2 with a short label (1,000 IU of D3 and 200 mcg of MK-4 per 2 drops) at a low cost per day. We have not confirmed an NSF listing for the liquid, and K2 can interfere with warfarin.