The FDA is concerned about aas, but selling garbage for consumption to uninformed or misinformed individuals for outrageous prices is o.k........ Am I missing something??
I'm not sure what your goals are but you said that you were having a hard time putting on weight so I assume that your trying to put it on. When trying to put on weight I would be more concerned with daily caloric and protein intake and keep emphasis on that versus the amount of meals taken in...
Why not both. Whey post workout and maybe blend before bed, so that your muscles are getting the proteins and aminos needed to build muscles while you sleep.