I take nitro-tech, which offers some vitamins and minerals of course with the protein. Two shakes does much more than provide a day's worth of cetain vitamins, now would mixing this with a multivitamin and a lifter's diet be bad for one's health and actually be toxic. I know too many vitamins can be toxic to the body. Any vitamins in particular i should be careful about taking too much of and are there any recommendations on what to do in this case to be careful.