Vitamin K : Overdose...

Toxicity does not easily occur with normal dietary intake of this vitamin, but can happen if synthetic compound Vitamin K 3 is taken. High to toxic uptake in the synthetic form can cause flushing and sweating. Jaundice and anemia may also develop.

If you are taking anti-coagulant (to prevent blood clotting) medication, consult your medical practitioner before taking a Vitamin K supplement.