I'd continue taking whatever supplements I normally take, so that the doctors can get results which indicate what I generally look like, in my blood. I'd just have a list to give them. Stopping them transiently probably changes nothing much, but doesn't indicate what your blood would normally reflect.

My B12 and Vit D run high, because I'm on supplements.

whats the scoop on tylenol.

Tylenol
 

may affect patients taking the blood thinner Coumadin:

http://www.warfarinfo.com/acetaminophen.htm

This does not impact everyone. But those who are typically unstable on Coumadin may be reacting to occasional Tylenol use.