The assumption
Peptide is a stamp of quality.
What the answer rests on
Think of a peptide as a short string of the small parts used to build proteins, like beads threaded together. One peptide you may recognise is insulin. As of September 2026, the word peptide alone does not tell you whether a product is approved or safe.
Approved for which use?
Sort the offer before comparing it
The federal agency overseeing drugs is the Food and Drug Administration, abbreviated FDA. Its approval applies to a particular medicine and use.
As of September 2026, FDA-approved products include Ozempic and Wegovy (semaglutide), along with Mounjaro and Zepbound (tirzepatide). Their uses include diabetes care and weight loss, depending on the particular product and whether it is a tablet or an injection.
The name on an offer still matters. Ask whether the offered medicine is a tablet or an injection and what its approved use is. Do not let a familiar drug name replace that conversation.
The short version
Similar words can describe different products
| What you hear | What it tells you |
|---|---|
| Peptide | Protein building blocks joined in a short string; insulin is one example. |
| Compounded | A medicine that a pharmacist or doctor makes to order. |
| Research use only | Labelled for laboratory work, not for people to take. This wording does not mean it is approved for treatment. |
Why compounding needs explaining
Made to order needs its own explanation
Compounding means preparing a medicine to order. It can help meet a need that a ready-made medicine cannot meet, such as avoiding a dye.
As of September 2026, a compounded drug goes to market without FDA checking its safety, results, or quality beforehand.
As of September 2026, FDA says federal law prohibits using retatrutide or cagrilintide in compounding. For neither drug has safety and effectiveness been established for any condition.
A doctor or other person giving medical care can start by asking what you want help with. What has already been tried? What would count as a useful change? What other choices belong in the discussion?
Untangle the product description
Is this medicine FDA-approved, made to order, or labelled “research use only”?
Keep a question in your notesEvidence for this chapter
Chapter notes
- FDA: compounding in plain terms
The reasons for compounding and the limits of approval.
- FDA: semaglutide product label
The approved uses for Wegovy tablets and injections.
- FDA: tirzepatide product label
The approved uses for Mounjaro.
- FDA: concerns about weight medicines
Includes the agency’s position on retatrutide and cagrilintide.