Best Vitamin K2 (MK-7) Supplements 2026: Cost per Effective Dose
A full dose of K2 a day costs $0.062 to $0.77 at list price across every size we price. Only 2 of the 17 are on a public testing list, and they cost $0.52 to $0.70 a day. The cheapest, Horbaach Vitamin K2 MK-7 100 mcg, is on none.
By Erin Rose Updated October 8, 2026 How we score
What K2 costs a day, cheapest first
| Product and size | A day | A year |
|---|---|---|
| Horbaach Vitamin K2 MK-7 100 mcg 250-softgel bottle, list $15.49, 100 mcg MK-7, plain MK-7Not found* | $0.062 | $23 |
| Bronson Vitamin K2 as MK-7 100 mcg 60-capsule bottle, list $9.99, 100 mcg MK-7, plain MK-7Not found* | $0.17 | $61 |
| NatureWise Vegan Vitamin K2 600 mcg 90-softgel bottle, list $14.99, 100 mcg MK-7, K blendNot found* | $0.17 | $61 |
| Doctor's Best Natural Vitamin K2 MK-7 with MenaQ7 100 mcg 60-capsule bottle, list $13.99, 100 mcg MK-7, plain MK-7Not found* | $0.23 | $85 |
| Sports Research Vitamin K2 MK-7 100 mcg 60-softgel bottle, list $16.15, 100 mcg MK-7, plain MK-7Not found* | $0.27 | $98 |
| Sports Research Vitamin K2 MK-7 180 mcg 60-softgel bottle, list $17.95, 180 mcg MK-7, plain MK-7Not found* | $0.30 | $109 |
| Thorne Vitamin K 60-capsule bottle, list $31.00, 90 mcg MK-7, K blendNSF/ANSI 173 | $0.52 | $189 |
| Nature Made Vitamin K2 100 mcg 30-softgel bottle, list $20.99, 100 mcg MK-7, plain MK-7USP Verified | $0.70 | $255 |
* Not found on the public NSF, USP or Informed lists (searched September 22, 2026 to October 5, 2026). To choose by need, see the best K2, scored.
A year of tested K2 costs $189 to $255
That is one full dose a day for the tested sizes we price. The cheapest untested size, Horbaach Vitamin K2 MK-7 100 mcg (250-softgel bottle), is $23 a year; you pay more for a product on a testing list.
Amazon sets its own prices. If its price is lower than the list price here, your dose costs less too.
You may not need K2 at all. Most U.S. diets have enough vitamin K, and the trials of K2 pills are mixed (what K2 does). If you take warfarin, don’t take K2 unless your doctor says so.
3 K products we checked but did not price
- Carlson Vitamin K2 MK-7 90 mcg: Amazon shows it as not yet in stock (October 5, 2026), so we cannot link it or score it.
- NOW Vitamin K-2 MK-4 100 mcg: MK-4 only. MK-4 is studied in milligrams, so we do not score it on the MK-7 scale.
- Thorne Vitamin K2 Liquid: MK-4 only, 15 mg (15,000 mcg) a serving, on NSF/ANSI 173. A drug-sized MK-4 dose, not an MK-7 product.
Sources
- Prices: each brand’s own list price, its regular one-time price, for every size it sells, checked October 5, 2026. We quote no Amazon prices; Amazon is only where the buy links go.
- The full-dose line: 90 mcg of MK-7 a day, the lowest daily dose a trial reported a benefit with. K2 dosage.
The unit is a full dose a day. Scores rebuilt October 5, 2026.