Supplement
Vitamin K2
Vitamin D's running mate, still proving itself.
Vitamin K2 (usually the MK-7 form) helps direct calcium into bone and away from soft tissue, working alongside vitamin D. We grade Vitamin K2 C+ on evidence and C+ for worth-it at about $10-15 per month.
Evidence
Worth it
Typical cost: $10-15/month
What it does
Vitamin K2 (usually the MK-7 form) helps direct calcium into bone and away from soft tissue, working alongside vitamin D. It is found in fermented foods like natto and in some animal products.
What the research says
Supports bone health in combination with vitamin D and calcium
Evidence: moderate. Trials of MK-7 show bone marker improvements; fracture outcomes are less established. Needs verification.
May slow vascular calcification
Evidence: emerging. Mechanistically plausible and early data is interesting; not proven. Needs verification.
DRAFT: sensible biology with early human data; waiting on harder outcomes.
Is it worth it?
DRAFT: inexpensive with plausible upside; the evidence has not caught up to the pairing hype.
Typical cost
$10-15/month
Common form, not a brand recommendation
Dosage contextemerging
100 to 200 mcg of MK-7 per day in most trials.
Safety notes
Do not take vitamin K2 if you use warfarin or other vitamin K antagonist blood thinners unless your doctor approves; it can reduce their effect. Otherwise well tolerated at typical doses. This page is information, not medical advice.
Longevity Lab Report
Vitamin K2 news, graded when it happens.
New studies, dose debates, and expert shifts on vitamin k2, in one email a week. Free.
Changelog
Last updated 2026-10-15
- 2026-10-15|Seed entry created as DRAFT. Warfarin interaction flagged in safety notes.
- 2026-10-15|Dosage context added.
- 2026-10-15|Goal tags added for the stack builder.