Getting started
First, name the treatment.
Begin with a simple question: “Which medicine are we discussing, by its full name?” A broad phrase like peptide therapy cannot answer that for you.
To begin
The word covers different things
The pieces that make proteins also form short chains called peptides; one example is insulin.
Calling something a peptide does not tell you whether US rules allow its supply, as of September 2026. The rules depend on whether it is an approved medicine, a medicine made for one patient, or an unapproved drug.
The federal agency responsible for the drug approval records in this guide is the Food and Drug Administration (FDA).
Look a little closer
Ask which kind of product it is
Two examples are semaglutide and tirzepatide, ingredients in medicines for blood sugar or weight. As of September 2026, Ozempic (semaglutide) and Mounjaro (tirzepatide) are approved to control blood sugar in people with type 2 diabetes. Wegovy (semaglutide) and Zepbound (tirzepatide) are approved for weight loss alongside changes to eating and physical activity.
Compounding involves making or changing a medicine for one patient instead of supplying a ready-made drug-company product.
As of September 2026, FDA has given no approval to compounded medicines. Before these medicines are sold, FDA does not assess whether they are safe, have the right quality, or work as intended.
A “for research use only” label presents the product as something for research, not patient care. Another label to look for is “not for human consumption”. FDA warns that weight-loss products sold to people with these labels may have unknown contents and cause harm.
Look a little closer
Bring the full name into the conversation
What is the medicine called, including any added ingredient?
Is it a tablet, an injection, or another form?
What health problem is it meant to address?
Is this an approved product or a medicine made for one patient?
Chapter recap
Keep this in mind.
The word peptide tells you what kind of substance it is. The full product name gives you something concrete to check.