In my own opinion critine is good. Building muscle is a challenge to everyone and having something that could boost ones muscle buildup is a nice thing .

Creatine raises kidney creatinine so this could also be a negative but this doesn't seem to last long and doesn't seem harmful from what I could find.

When considering an intake of a substance or supplement, the side effect plays a major role on the level of intake of such. But with this I just read then there’s no harm in critine only some muscles 💪🏻