strict regulations like foods and drugs. "The purity might not be proven in some protein supplements," says Smith. "They can have fillers or heavy metal contaminants that aren't listed on the label." Choose whey protein products that ...
includeConsumerLab.com,NSFInternational, andUSP.Third-Party Testingcompanies test the product and display a quality assurance seal. A Third-Party Testing Seal indicates the product was manufactured correctly, contains the ingredients listed on the label, and does not contain harmful levels of ...