WASHINGTON, July 2 -- BPC-157, a peptide sold online as a cure for tendon injuries and inflammatory bowel conditions, has never been tested in a rigorous human clinical trial. Health Secretary Robert F. Kennedy Jr. says he has used it for injuries with good results and has spent months pushing federal regulators to make it more accessible. The Food and Drug Administration's own scientists have now concluded there is not enough evidence to recommend it, or any of the six other peptides set for federal review later this month, while the advisory panel charged with weighing that scientific judgment has been reconstituted with members who own businesses that sell the very compounds under scrutiny.

In briefing documents published ahead of a J...