Quote Originally Posted by Immortal Soldier View Post
Tylenol (Acetaminophen) causes roughly drop in protein synthesis when taken. The same can be said for NSAID's such as ibuprofen, although it's to a lesser degree.

Obviously he will still grow, the Tylenol will hinder it to a small extent, that extent could be very minuscule or palpable i'd go with the former.
agreed^^^ but as that was already stated i didn't see the need to mention it again, i was thinking more along the lines of a contraindicator he might take on cycle(like a CNS stimulant) that could cause serious side effects