Are these stuff im takin harmful to my health/ Negative side effect?

I've been working out for about a year, but last week i decide to buy Vita Pack Mega Men Sport vitamins pack from GNC, AMP XXX Protein and C4 Nitric Oxide so i can get the best out of my work out. But my question is im kinda worried about these supplement. I take a pack of vitamins daily, contain about 7 pills but i only take 5 and leave the 2 nitric oxide alone because i have the C4, i take the C4 around 10mins before work out and everyday i drink AMP XXX protein around twice a day. So i was wondering are all these stuff im talking bad for me? like will it leave any negative side effect?? Help please