Head to head
Vitamin D3 vs Vitamin K2 (MK-7)
On the strength of human evidence, Vitamin D3 comes out ahead (evidence 55 vs 35). But they're often used for different things — read each claim before deciding.
Vitamin D3
Moderateessential if low, oversold if not
Marketing intensity 80 of 100. Evidence strength 55 of 100. Verdict: Overhyped.
Real and important if you're deficient. Marketed as a cure-all for people who already have enough.
Full evidence on Vitamin D3 →Vitamin K2 (MK-7)
▲ Trendingthe calcium-traffic-cop, on surrogate evidence
Marketing intensity 70 of 100. Evidence strength 35 of 100. Verdict: Overhyped.
A plausible idea - help calcium land in bone, not arteries - with promising biomarker and imaging data. But hard clinical proof (fewer fractures, fewer heart attacks) isn't there yet.
Full evidence on Vitamin K2 (MK-7) →Side by side
| Metric | Vitamin D3 | Vitamin K2 (MK-7) |
|---|---|---|
| Overall tier | Moderate | Limited |
| Evidence score | 55/100 | 35/100 |
| Hype score | 80/100 | 70/100 |
| Verdict | Overhyped | Overhyped |
| Safety concern | low | low |
Quick answers
Vitamin D3 or Vitamin K2 (MK-7) — which has better evidence?
On the strength of human evidence, Vitamin D3 comes out ahead (evidence 55 vs 35). But they're often used for different things — read each claim before deciding.
Can you take Vitamin D3 and Vitamin K2 (MK-7) together?
This page compares the evidence, not interactions. Some supplements interact with each other or with medications — check each one's safety section and talk to a pharmacist before stacking.