Compounded semaglutide: what it is, what to verify, what to track
Compounded semaglutide is the same active molecule as Wegovy and Ozempic, prepared by a 503A pharmacy instead of Novo Nordisk. The difference is in concentration, additives, storage, and what you have to verify yourself.
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Verified May 10, 2026: Compounded semaglutide is the same active molecule as Wegovy and Ozempic, prepared by a pharmacy instead of a manufacturer. It exists because Wegovy and Ozempic spent most of 2023 and 2024 on the FDA drug shortage list, and US compounding pharmacies have legal latitude to produce shortage drugs under section 503A of the Federal Food, Drug, and Cosmetic Act.
How it differs from Wegovy and Ozempic
The molecule is identical. The product is not. Compounded semaglutide differs in four practical ways:
- Concentration varies pharmacy-to-pharmacy. A 5 mg vial reconstituted in 1 mL of bacteriostatic water gives 5 mg/mL. The same vial in 2 mL gives 2.5 mg/mL. The dose volume in syringe units changes accordingly.
- Additives are sometimes included. Some pharmacies add B6, B12, glycine, or L-carnitine. These additives are marketed as adjuncts but lack the trial data of the base drug.
- Storage stability is shorter. Compounded versions typically have a beyond-use date (BUD) of 28 days post-reconstitution and require refrigeration. Manufactured pens are stable longer.
- The titration ladder still applies. Compounded does not mean weaker. The 0.25 mg → 0.5 mg → 1.0 mg → 1.7 mg → 2.4 mg ramp from the Wegovy FDA label still produces the side-effect profile your GI tract expects.
Questions to ask the pharmacy
Before your first vial ships, get answers to these in writing:
- What is the vial mg and the BAC water volume? (You need both to calculate dose volume.)
- Are there additives, and what are the concentrations of each?
- What is the BUD post-reconstitution?
- What is the storage requirement before reconstitution?
- Is the pharmacy a 503A or 503B facility?
- Where is the active pharmaceutical ingredient (API) sourced from?
A reputable compounding pharmacy will answer all six without hesitation. Hesitation is information.
Reconstitution math, in one line
The formula is the same regardless of pharmacy:
On a U-100 insulin syringe, 1 unit equals 0.01 mL. So a 0.05 mL dose is 5 units. A 0.10 mL dose is 10 units. The most common error is treating "units" as "milligrams" — they are not the same thing. For worked examples, see the reconstitution calculator guide.
What changes if your pharmacy switches concentrations
When a pharmacy ships a refill at a different vial mg or BAC water volume, your dose volume in units changes even if your dose in mg stays the same. Reading every refill's instructions is not optional.
If you're stable on 25 units of compounded semaglutide and a refill arrives reconstituted at half the prior concentration, you need to draw 50 units to get the same dose. Drawing 25 cuts your dose in half. The body responds in week two.
What to track, week to week
The variables worth logging from day one:
- Dose volume (mL or units) and the corresponding mg
- Day of the dose
- Side effects, anchored to the day they appeared
- Body weight at a consistent time of day
- Vial inventory — when you opened it, when the BUD expires
- Pharmacy concentration data so refills can be cross-checked
A spreadsheet does this until the math gets in the way. After two months of cross-references between mg, mL, units, and concentration, most users move to a tool. Titrate is built for that moment.
Frequently asked questions
Is compounded semaglutide as effective as Wegovy?
The active molecule is the same — semaglutide is semaglutide. Clinical efficacy depends on whether the compounded product matches the FDA-approved dosing ladder and is reconstituted correctly. There are no head-to-head trials of compounded vs branded semaglutide because compounded versions are pharmacy-specific.
Is compounded semaglutide still legal in 2026?
503A patient-specific compounding under medical-necessity criteria remains legal. 503B bulk compounding is banned because the FDA removed semaglutide from the shortage list in October 2024. State-by-state enforcement varies.
How long does a compounded semaglutide vial last?
Most pharmacies specify a 28-day beyond-use date (BUD) post-reconstitution under refrigeration. Some go up to 56 days; verify in writing on every refill.
Why are some compounded versions cheaper than $200/mo?
Compounding pharmacies don't pay Novo Nordisk's manufacturing or marketing costs. The active ingredient is sourced as a bulk powder from API suppliers and reconstituted in-pharmacy. Cash-pay compounded prices typically run $150-$350/month vs $1,000+/month for Wegovy.
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting, modifying, or stopping any medication or peptide protocol. Information is current as of the publication date and may change.