Vitamin K is a high-risk supplementwith an RDA of 120 mcg and a safe upper limit (UL) of 1000 mcg per day according to FDA standards. All 3 regional standards agree on these limits. It has 3 known interactions with other supplements including vitamin d, vitamin d3, vitamin e. Regular monitoring is strongly recommended when adjusting your intake.
Vitamin K sits in the Fat-Soluble Vitamins category. This page consolidates 3 regional standards, and the numbers are broadly aligned, so the bigger question is whether your total dose stays in range.
It also has 3 known interactions, so the question is not just the label dose but whether the rest of your stack adds extra risk.
Vitamin K affects blood clotting; high doses can interact with warfarin and similar drugs.
| Region | Organization | RDA | Upper Limit (UL) | Unit |
|---|---|---|---|---|
| πΊπΈ United States | FDA | 120 | 1000 | mcg |
| πͺπΊ Europe | EFSA | 120 | 1000 | mcg |
| π¦πΊ Australia | TGA | 120 | 1000 | mcg |
RDA = Recommended Daily Allowance (adequate intake for most adults). UL = Tolerable Upper Intake Level (maximum safe daily amount).
Vitamin D increases calcium absorption; Vitamin K helps direct calcium to bones.
Consider taking both together for bone health.
Vitamin D3 increases calcium absorption; Vitamin K helps direct calcium to bones.
Consider taking both together for bone health.
High doses of Vitamin E may interfere with Vitamin K function.
Keep Vitamin E below 400 IU if taking blood thinners.
First match your product label against the dose table above, then check whether the known interaction list includes anything in your current stack.
If you are taking multiple supplements, the safest approach is usually to audit the whole stack instead of judging a single bottle in isolation.
The safe upper limit (UL) for Vitamin K is 1000mcg per day according to FDA. Exceeding this amount regularly may increase the risk of adverse effects.
The RDA for Vitamin K is 120mcg per day for most adults. This amount is sufficient to meet the needs of 97-98% of healthy individuals.
Yes, Vitamin K has 3 known interactions with other supplements. Vitamin D increases calcium absorption; Vitamin K helps direct calcium to bones.
Check if your supplement stack keeps Vitamin K within safe limits.
Audit My SupplementsDisclaimer: NutriAudit is a decision-support tool designed to help you review your supplement stack for potential duplicate, conflicting, or excessive ingredients. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your supplement routine, especially if you are pregnant, nursing, taking medications, or have a medical condition.
Based on reference standards from FDA, EFSA, TGA, and MHLW.