Compounded semaglutide vs Ozempic

They share a molecule name. Almost everything else is different, and one of the differences is that a company is not legally allowed to tell you they are the same.

The first correction: Ozempic may be the wrong comparison

Ozempic and Wegovy both contain semaglutide, from the same manufacturer. Ozempic is approved for type 2 diabetes. Wegovy is approved for weight management, at a different dosing schedule.

If you are taking semaglutide to lose weight, the approved product that matches what you are doing is Wegovy, not Ozempic. A lot of comparison content online quietly uses Ozempic because it is the more searched name, and that muddles the discussion before it starts.

What actually differs

Review. The approved product went through clinical trials the FDA examined, and the FDA inspects how it is manufactured. A compounded product is prepared by a licensed pharmacy and the specific medicine is not reviewed by the FDA before it reaches you.

The active ingredient, sometimes. Some products sold as semaglutide have used salt forms, semaglutide sodium or semaglutide acetate. The FDA has said these are different active ingredients from the one in the approved drugs. Not a different concentration. A different ingredient.

How you take it. Approved semaglutide comes in a pre-filled pen with fixed dose settings. Compounded semaglutide is frequently supplied as a vial and syringe, which puts the measurement in your hands. The FDA has received adverse event reports, some involving hospitalisation, connected to dosing errors with compounded injectable semaglutide.

The dose schedule. The approved product has a titration schedule that was tested. The FDA has received reports of patients on compounded product being prescribed beyond the approved label, through larger single doses, more frequent dosing, or faster increases.

Additives. Compounded versions are often combined with something else, commonly vitamin B12. That is usually part of the legal argument for why the product is not "essentially a copy" of the approved drug rather than a clinical decision about you.

Price. Compounded has generally been much cheaper. That gap narrowed considerably in 2026, which we cover separately.

The five things a company cannot tell you

The FDA has published the specific claims telehealth companies must not make about compounded drugs. Three of them are about exactly this comparison.

1. Calling it a generic version of, or the same as, an FDA approved drug. There is no generic Ozempic or Wegovy.
2. Saying or implying it is FDA approved or has been evaluated for safety and effectiveness.
3. Saying it is clinically proven to produce the same result as the approved drug.

The other two are about branding that implies the telehealth company made the drug, and describing the source as an "FDA approved" or "FDA licensed" pharmacy. In the FDA's own words, compounding facilities "are not 'FDA-approved' or 'FDA-licensed' entities."

A very common version of claim two is the phrase "same active ingredient as" followed by a brand name. The FDA has quoted that exact language back to companies in warning letters.

Does the difference show up in results?

In the only real world comparison available, 923 patients on compounded semaglutide were compared with 1,858 on the approved product over four months, on the same titration schedule. Average weight loss was 9.11 percent on compounded against 9.87 percent on approved. At the fifteen percent threshold the gap was wider: 12.8 percent against 21.4 percent.

There has never been a randomised trial comparing the two.

What has not changed

Both are semaglutide, and semaglutide works. The approved product's trial evidence is genuinely strong. If a compounded version is what you have access to and a clinician is supervising you, that is a real conversation to have with them rather than with a web page.

What we would push back on is the framing that these are the same product at two prices. They are two different products, one of which has been examined and one of which has not.

What to ask

• Is my prescription semaglutide, or a salt form such as semaglutide sodium or acetate?
• Am I comparing this to Ozempic or to Wegovy, and which one matches my reason for taking it?
• Is my titration schedule the same as the approved product's?
• What else is in the vial, and why?
• What would the approved product cost me now, through insurance or the federal channels?

Sources

• FDA, "FDA to Telehealth Companies: What to Know When Promoting Compounded Drugs"
• FDA, "FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight Loss"
• Federal Food, Drug, and Cosmetic Act sections 503A and 503B, 21 U.S.C. 353a and 353b
• Talay L, Vickers M. Retrospective comparison of compounded and FDA approved semaglutide in a digital weight loss service, 2024

How we verify: see /how-we-verify.

Keep reading

The one comparison study in full, at /guides/does-compounded-semaglutide-work.

What compounded GLP-1s cost now that the approved products got cheaper, at /guides/compounded-glp1-cost.