Chapter one
What does “peptide” mean?
Treat the word as a starting point. Ask for the exact medicine name before comparing care.
The word
The word describes a substance, not what it treats.
Think of beads on a string: a peptide is a short chain of small chemical pieces. Those pieces also make larger chains called proteins.
Insulin is an example of a peptide.
As of September 2026, US drug rules depend on whether the medicine is approved, legally made to order, or sold without approval. Calling it a peptide does not answer that question.
Knowing a product is a peptide does not establish that it is safe.
The kind of medicine
Ask which kind of product it is.
FDA approval requires the Food and Drug Administration to review the drug for a specific use.
As of September 2026, semaglutide and tirzepatide are ingredients in FDA-approved medicines for type 2 diabetes or weight management. Semaglutide is sold as Ozempic for diabetes and Wegovy for weight management. Tirzepatide is sold as Mounjaro for diabetes and Zepbound for weight management. Some of these medicines also have other approved uses.
With compounding, a doctor or pharmacist makes medicine to suit an individual patient’s need.
As of September 2026, FDA has not approved compounded products.
As of September 2026, FDA says no retatrutide or cagrilintide product is approved. Federal law does not allow either ingredient in compounding.
Your question
Match the question to your goal.
Start with the health problem you want help with. Then ask why this exact product is being considered.
An answer about another medicine does not settle the question you came with.
- What condition are we trying to treat?
- Why this medicine rather than an approved option?
- Which studies show whether this exact medicine helps with my health problem?