hm... i never heard of this...so far so good when i took it last time... i am not sure if you are referring to specific product..... there are lots of body building products out there aside mass gainer and pure whey like creatine etc or additional additive.....if u really scare then u use the traditional method lor... count ur carbo and count ur protein intake on a daily basis then count ur food calorie and protein intake lor. on normal food usually its hard to get enuv protein intake.

yes it is ok. it is just a supplement.

FYI, whey protein in market contain no steroid lah...

  remember to do weight exercise when u taking the protein... one can only gain weight if his body receive enuv supplement. weight in term of muscle and correct % of fat. ideally 10% is good enuv... else if you just do weight training without proper supplement your body goes catabolism.. i got a fren who does not take supplement for his weight training but he whacks a lot of food and eggs... end up he is big but not very define cause more body fats..