What does “research use” mean?

Research use: read past the label

“For research use only” describes a product offered for studies, rather than treatment for a person. In letters to sellers, FDA (the U.S. drug agency) says those words do not make it lawful to sell an unapproved drug for people to use.

These warning letters accuse named sellers of breaking the rules. They are not court decisions.

FDA looks at what the seller says the product will do. Claims about weight, healing or effects on the body can show that it is being offered as a drug, even with a research label.

Investigational: still being studied

Retatrutide and cagrilintide had no FDA approval at this check.

According to FDA, federal law bars both ingredients from compounding, which means making or changing medicine for a patient’s need.

Seeing a study discussed online is different from being offered an approved medicine. Ask which status the actual product has.

Withdrawn request: no green light

FDA lists some peptide ingredients proposed for pharmacy-made medicines on a page marked as current as of April 22, 2026. The people or groups who asked for permission took their requests back.

Withdrawing a request is not permission to use the ingredient in pharmacy-made medicine. FDA still lists its safety concerns beside those ingredients.

Committee advice: no rule change by itself

An FDA advisory committee gives advice. Its vote alone cannot change the legal compounding list.

A change to that list needs a final FDA rule, issued after public comment.

For a headline claiming an ingredient is now allowed, ask to see that rule. Ask which ingredient it names and how the medicine may be given, such as by a shot.