from Raffaini's brochure on surgery:
" AVOID THE CONSUMPTION of any of the following foodstuffs and
products in the two weeks prior to the operation:
PINEAPPLE, ARNICA, ONION, GARLIC, TOMATOES, GINSENG (all of
which may impair blood coagulation if consumed in large quantities)."
I would not trifle with this kind of stuff unless you know the relationship of the constituents.