Semaglutide Sodium vs Semaglutide: What the FDA Said and How to Check Your Vial
The chemistry of salt forms versus base semaglutide, why the FDA says semaglutide sodium and acetate do not qualify for compounding, how to read a Certificate of Analysis, and which providers make verification easy.
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The one-paragraph version
Semaglutide (base form) is what is in Ozempic, Wegovy and Rybelsus and what licensed compounding pharmacies are permitted to use. Semaglutide sodium and semaglutide acetate are salt forms of the same peptide that the FDA says are different active ingredients, with no human safety or efficacy data and no legal basis for compounding. They have shown up mainly in research-chemical supply chains and unlicensed online sellers. The fix is simple: ask for the Certificate of Analysis and confirm it says "semaglutide," not a salt.
Base vs salt: the chemistry in plain English
| Semaglutide (base) | Semaglutide sodium / acetate | |
|---|---|---|
| What it is | The peptide as a free acid | Same peptide + a sodium or acetate counter-ion |
| In FDA-approved drugs? | Yes — Ozempic, Wegovy, Rybelsus | No |
| Legal for 503A compounding? | Yes (component of an approved drug) | No — FDA says it does not meet requirements |
| Human trial data | Extensive (STEP, SUSTAIN, SELECT) | None |
| Dose equivalence | Established in mg | Unknown; molecular weight differs |
| Typical source | Pharmaceutical-grade API via licensed pharmacies | Research-chemical suppliers, grey-market vendors |
| CAS number on CofA | 910463-68-2 | Different / often absent |
A salt is not automatically worse — many approved drugs are salts — but it is a different molecule for regulatory and pharmacokinetic purposes, which is why it cannot ride on Ozempic's approval.
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What the FDA actually said
The agency's compounding guidance and consumer warnings since 2023 make three points: (1) it has received adverse-event reports tied to compounded semaglutide; (2) some compounders were using semaglutide sodium or acetate; (3) those salts are not the active ingredient in any approved drug, are not on the 503A bulk-substances list, and therefore do not meet the requirements for compounding. Several state pharmacy boards followed with their own prohibitions. The FDA did not say base-form compounded semaglutide from a licensed pharmacy is illegal — it said salts are. The broader context is in compounded vs brand semaglutide.
How to read your Certificate of Analysis
- Active ingredient name: "Semaglutide" — not "semaglutide sodium," "semaglutide acetate," or "semaglutide salt."
- CAS number: 910463-68-2 for base semaglutide.
- Potency / assay: e.g. 2.5 mg/mL, with a result inside 90-110% of label.
- Purity: typically ≥98% by HPLC, with related substances listed.
- Sterility and endotoxin: pass results for an injectable.
- Pharmacy name, license number, lot and beyond-use date — matching your vial label.
A provider that cannot produce this within a day for your lot is a provider that cannot verify what it sent you. Providers that publish a CofA per vial, such as Precision Telemed, remove the question entirely.
Red flags that usually mean a salt form or worse
- No prescription required.
- Vials labelled "for research use only" or "not for human consumption."
- Prices far below the ~$69/month floor for pharmacy-compounded product.
- Pharmacy not named, or not findable on the state board of pharmacy licence lookup.
- Lyophilised powder shipped with bacteriostatic water for self-reconstitution from a non-pharmacy source.
- "Semaglutide sodium" or "acetate" anywhere on the label or listing.
More in how to spot fake and grey-market GLP-1s.
Providers that make verification easy
| Provider | Pharmacy disclosure | CofA | LegitScript |
|---|---|---|---|
| Precision Telemed | Named 503A | Published per vial | Yes |
| Cora Health | Hallandale, VialsRx (named) | On request | Yes |
| Trimi | Named with licence numbers | On request | Unclear |
| Pomegranate | Named | On request | — |
| Enhance.MD | Named 503A/503B | On request | Yes |
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Compounded semaglutide & tirzepatide prescribed online by US-licensed providers. No insurance needed — medication shipped to your door in 3-5 days.
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Doctor-backed GLP-1 weight loss from $147/month
Compounded semaglutide & tirzepatide. Online consultation with a US-licensed provider. No insurance needed.
⚡ Limited spots this month — 50,000+ patients already started
Paid partnership · Prescription product · Not everyone qualifies · Results vary
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