Originally Posted by NewRuth

Vitamin K is the antidote to the blood thinner Warfarin(Coumadin), but people who take Warfarin are going for blood that takes at least twice as long as normal to clot. Some people are shooting for 3.5 times the normal clotting time! When warning about these things, they say "blood thnners" as a general category. Not all blood thinners are affected by Vitamin K.

Linus Pauling Institute says there's not known toxicity for K1 and K2, but there are some issues with K3 (the synthetic). There has been no upper limit established for Vitamin K.