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Dosage guide

Vitamin K2 (MK-7) dosage guide: how much to take in 2026

Vitamin K2 (MK-7) works only at the right dose in the right form. This guide covers the effective range, timing, best forms, and interactions to know.

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US RDA

90 to 120 mcg daily (combined K1 and K2)

Effective dose

90 to 180 mcg daily MK-7 form

Upper limit

No established upper limit for K2. Very safe.

Timing

With largest fat-containing meal

With food

Yes, requires dietary fat

Bioavailability

MK-7 (long-chain) > MK-4 (short-chain) for sustained blood levels

Best forms to buy

MK-7 90 to 180 mcg

Long-lasting, best for daily use

MK-4

Shorter duration, higher dose needed

Combined MK-4 and MK-7

Full spectrum

Signs of deficiency

  • · Vascular calcification
  • · Bone weakness
  • · Poor calcium utilization

Drug interactions

  • · Blood thinners (particularly warfarin)

Toxicity

None known.

FAQ

Common questions

How much Vitamin K2 (MK-7) should I take?

90 to 180 mcg daily MK-7 form

When should I take Vitamin K2 (MK-7)?

With largest fat-containing meal

Can I take too much Vitamin K2 (MK-7)?

None known.

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Sources

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This article is for informational purposes only and does not constitute medical advice. Consult a licensed healthcare provider before starting new treatments, supplements, or procedures. Links to products may be affiliate links. Smart Milky may earn a commission at no additional cost to you.