Supplement Studies

The dietary supplement industry is constantly adding new products. Many manufacturers do their best to keep harmful ingredients out of their supplements, but some bad actors use ingredients that are not safe.

NSF International scientists, working to protect and educate consumers, have done research on dietary supplements and found ingredients that are harmful to your health. Consumers should take care to avoid dietary supplements that may contain these ingredients.

To learn more, watch a video about the top ingredients to avoid.

Look for the Mark

To be sure of the ingredients in supplements, look for the NSF certification mark. We certify both dietary and sports supplements to verify that what is on the product label matches what is in the package. The NSF marks (NSF Certified and NSF Certified for Sport®) help consumers and athletes make more informed decisions about supplement products.