FDA warns about Neptune's Fix supplements after reports of seizures and hospitalizations

The Food and Drug Administration is warning consumers not to use or purchase any products from the supplement brand called Neptune's Fix after receiving multiple reports of severe reactions, including seizures and hospitalizations. The FDA says it is testing samples for illegal and harmful ingredients.

Neptune's Fix supplements purport to contain tianeptine, an opioid alternative prescribed as an antidepressant in some Latin American, Asian and European countries. Tianeptine is not approved for use in the U.S.

The FDA has previously warned about this "potentially dangerous" substance, which the agency says has been linked to addiction and deadly overdoses.