Evidence brief · Supplement
Vitamin K1 for Blood clotting
Evidence grade A — Definitional
- Overall grade
- Grade A
- Last revised
- 1
- graded outcome
- 0
- references listed
Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.
1 at grade A — 1 graded row
What is known
Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.
- Blood clottingEvidence grade A
Definitional
Largehigh
The evidence in words
The verdict
For blood clotting, Vitamin K1 earns evidence grade A (large effect, high consistency) — there is real evidence here. Definitional
How it might work
K1 activates clotting factors in the liver via carboxylation; it is the direct antagonist of warfarin, which blocks that recycling.
How to use it
Obtained from leafy greens; supplementation is rarely needed outside clinical settings. On warfarin, keep intake steady rather than avoiding greens.
Safety & cautions
Very safe; the key issue is consistency for anyone on vitamin-K-antagonist anticoagulants.
Bottom line
You get enough from greens. If you take warfarin, the rule is steady, consistent vitamin K — not avoidance.
How it is used
As the entry records it, from the studies it summarises. Not a recommendation for you — doses that suit a trial population may not suit you.
- Food-first
- Leafy greens; keep intake steady on warfarin.
Goes with
- Vitamin K1Read the full Vitamin K1 monographEvidence grade B
Related reading
Entries that share this one's tags or conditions.
- Vitamin K1 for Warfarin reversal (clinical)Evidence grade A — Medical useEvidence grade A
- Krill Oil for Omega-3 indexEvidence grade B — Raises index; dose to EPA+DHAEvidence grade B
- Vitamin K1: dosage and how to take itLeafy greens; keep intake steady on warfarin.Evidence grade B
- Vitamin K1: side effects, safety & interactionsVery safe; the key issue is consistency for anyone on vitamin-K-antagonist anticoagulants.Evidence grade B
Sources
This entry lists no references of its own — it is assembled from the entries it links to, whose sources are on their pages.
Last revised . A grade is this entry's reading of the evidence, not medical advice.