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12 Best Clean Protein Powders on the Market - Men's Journal Whey protein is derived from cow’s milk, which makes it a dairy product. During cheese production, whey is separated and isolated. Most dairy milk contains two types of protein: casein (80 percent) and whey (20 percent). After that, whey protein goes through some processing to make it whey powder, and this is where it can get unhealthy. Most whey p... New Study of Protein Powders from Clean Label Project Finds ... Feb 27, 2018 · New Study of Protein Powders from Clean Label Project Finds Elevated Levels of Heavy Metals and BPA in 53 Leading Brands. The new independent study shows lead, BPA, mercury, cadmium and arsenic are present in top-selling nutritional protein powder supplement products. The Truth About Protein Drinks - Consumer Reports Mar 26, 2020 · A 2018 study from the nonprofit Clean Label Project of 134 popular protein powders found detectable levels of heavy metals such as arsenic, cadmium, mercury,...