Vitamin K: which form, what each one does, and the dose that worked
Vitamin K comes in many forms, and what it does depends on the form. Every result below names the form it came from. Pick the form you take to see its own studies, products and what the biohackers say about it. This page is educational, not medical advice.
What it does, by goalMembersThe top 5 of 8 goals
| Goal | What the studies show | Studies | Dose that worked |
|---|---|---|---|
| Improved in studies K2 as MK-7: 16 of 41 improved, 6 no effect · K2 as MK-4: 14 of 35 improved, 2 no effect · K1: 10 of 35 improved, 9 no effect | 111 | K2 as MK-7 45 mcg · K2 as MK-4 1.5 mg | |
| Improved in studies K2 as MK-7: 7 of 20 improved, 7 no effect · K1: 4 of 11 improved, 1 no effect | 31 | K2 as MK-7 90 mcg · K1 10 mg | |
| Improved in studies K2 as MK-4: 2 of 4 improved, 1 no effect · K2 as MK-7: 2 of 3 improved, 1 no effect · K1: 1 of 4 improved, 2 no effect | 11 | K2 as MK-4 45 mg · K2 as MK-7 180 mcg | |
| Improved in studies K1: 1 of 2 improved · K2 as MK-7: 1 of 2 improved | 4 | – | |
| Improved in studies K2 as MK-4: 1 of 1 improved · K1: 3 studies, 1 no effect · K2 as MK-7: 2 studies, 1 no effect | 6 | K2 as MK-4 45 mg | |
| Improved in studies K2 as MK-7: 1 of 1 improved | 1 | K2 as MK-7 90 mcg | |
| Improved in studies K2 as MK-7: 1 of 1 improved | 1 | K2 as MK-7 240 mcg | |
| Too few studies K1: 1 study, no clear result | 1 | – |
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Products – highest ranked firstMembersThe top 3 of 16
Dose and safetyThe dose that worked and the upper limit
The doses that worked, by form, in the studies taken by mouth: K2 as MK-7 45 to 375 mcg, K2 as MK-4 1.5 to 45 mg, K1 100 mcg to 10 mg a day.
Biohacker panelMembersWhich forms of vitamin k our 10 biohackers name
Questions people askMembersAnswered from the figures on this page
Which form of vitamin k is best?
Answer for members.
How much vitamin k a day?
Answer for members.
Can I take vitamin k with my meds?
Answer for members.
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Educational, not medical advice. Figures come from the human studies on PubMed we have graded; a study counts for a form when it names the form it used. Updated as new studies arrive. How we grade →