I am 16 years old i play body building can i take supplements like amino acids and multivitamin and protein powders and fish oil without side effects?

Shouldn't be: A problem but remember that hydration is important with high protein loads.

Yes, but: Follow the labeled instructions. It's easy to think, "if a little is good, more must be better" but remember, one needs water to live but with too much, one will drown! it's the physical work, not the supplements, that will result in a beautiful and powerful body.