Peptides for weight loss: what's FDA-approved and what isn't

What "peptide" means here

A peptide is a short chain of amino acids, the building blocks of proteins. Your body makes many peptide hormones, including GLP-1, a gut hormone involved in appetite and blood sugar.

The word gets used two very different ways online:

• Approved medicines that happen to be peptides, such as semaglutide. These have gone through FDA review for a specific use, and they come with an FDA-approved label.
• Unapproved substances sold as "peptides," often as powders in vials. These haven't been through that review.

The term "peptide therapy" can blur the two. The useful question is always: is this exact product FDA-approved, and for what?

FDA-approved peptide medicines for weight management

These are the peptide medicines whose FDA-approved labels include long-term weight management. Each one is approved to be used with a reduced-calorie diet and more physical activity.

Some important details from the labels:

• Don't combine them. The Wegovy, Zepbound and Saxenda labels each say using them with another GLP-1 receptor agonist isn't recommended.
• Setmelanotide is narrow. Its label says it isn't expected to work for other types of obesity.
• Semaglutide also comes as a pill. Wegovy is available as both an injection and a tablet. Our Foundayo guide covers another daily pill option.

All of these require a prescription. Whether any of them fits you is a conversation for a licensed prescriber.

Approved, but not for weight loss: tesamorelin

Tesamorelin (Egrifta) is an FDA-approved peptide that's sometimes marketed online for fat loss. Its label approves it for one use: reducing excess abdominal fat in adults with HIV who have lipodystrophy. The label states plainly that it's "not indicated for weight loss management."

Not FDA-approved for any use

Retatrutide and cagrilintide

These are experimental drugs. The FDA says they "cannot be used in compounding under federal law," aren't components of any FDA-approved drug, and "have not been found safe and effective for any condition." The FDA has warned telehealth companies, ingredient distributors and outsourcing facilities over retatrutide.

AOD-9604, CJC-1295, ipamorelin and BPC-157

None of these is an FDA-approved drug. The FDA keeps a public page listing bulk substances it flagged for possible significant safety risks in compounding. Several peptides now sit in a section of that page for nominations that were withdrawn by the people who nominated them, but the FDA's safety notes are still posted. Ipamorelin acetate is still in the safety-risk category for outsourcing facilities.

Why "removed from the list" doesn't mean "approved"

A licensed pharmacy can compound from a bulk substance only if it meets a USP standard, is part of an FDA-approved drug, or is on the FDA's 503A bulks list. The FDA adds substances to that list through formal rulemaking.

In July 2026 the FDA asked its Pharmacy Compounding Advisory Committee for advice on seven peptides, including BPC-157. In its briefing, FDA staff noted that BPC-157 has no USP monograph and isn't part of any approved drug. They also said the evidence weighed against adding it to the bulks list, citing poor characterization, a lack of safety information and insufficient evidence of effectiveness for the use reviewed, ulcerative colitis. That review wasn't about weight loss at all. The FDA said it wouldn't make a final decision until it had considered the committee's advice and finished its reviews.

Compounded versions of approved drugs

Compounded semaglutide and tirzepatide are a separate issue. The FDA says compounded drugs "are not FDA approved," which means the agency doesn't review them for safety, effectiveness or quality before they're sold. The FDA has reported adverse events tied to dosing errors with compounded semaglutide and says salt forms such as semaglutide sodium are different active ingredients from the ones in approved drugs. Our compounded GLP-1 recall guide covers this in more detail.

"Research use only" products

Some websites sell peptides labeled "for research purposes" or "not for human consumption." The FDA says it has warned companies that sold unapproved drugs containing semaglutide, tirzepatide, retatrutide, survodutide or mazdutide this way, often with dosing instructions. The FDA urges consumers not to buy these products, "which are of unknown quality and may be harmful to their health."

Red flags the FDA lists

The FDA's list of warning signs when buying weight-loss drugs online includes a seller that:

• Claims a compounded drug is the same as an FDA-approved drug
• Offers prices that seem too good to be true
• Doesn't require a screening and prescription by a licensed doctor
• Has no licensed doctor available to answer questions
• Sends medicine that looks different, arrives damaged or has no instructions

Whatever a prescriber decides, the habits around eating and activity stay with you every day. Olive is a health companion that checks in with you every day, looks at what you eat, and helps you build small habits that actually hold. It doesn't diagnose or treat anything, and it doesn't sell or supply any of the products on this page.

Use cases: what to do in common situations

• "A clinic offered me a peptide for weight loss." Ask for the exact drug name and whether that product is FDA-approved for weight management. Check the label yourself.
• "I saw retatrutide for sale online." The FDA says it isn't approved for any condition and can't legally be compounded.
• "Someone recommended tesamorelin to lose belly fat." Its label says it isn't indicated for weight loss management.
• "I read that BPC-157 is now legal." Leaving the FDA's safety-risk category isn't FDA approval. Check the FDA's 503A bulks list page for its current status.
• "I'm on compounded semaglutide." Talk with your prescriber about the product, the source pharmacy and how to measure each dose. Our guide on whether a naturopath can prescribe GLP-1s explains who can prescribe.

This guide is general information, not medical advice. Talk with a licensed prescriber before starting, stopping or changing any medicine, and don't use products that aren't FDA-approved.

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