Consumer Reports Investigation to Protein Drinks Link – link to video report
Basically, there are two out there that Consumer Reports says you need to heed caution. If you are taking too much you are exposing yourself to harmful heavy metals like Arsenic, Lead, and Cadmium. How much is too much? 3 servings a day. This is not unusual for some Triathletes.
Of course, one report in itself can be questioned, do your homework! I have come to trust Consumer Reports for many years. Now go drink some Eggnog instead with raw egg and Bourbon!