Learn what a tesamorelin 12mg vial contains, how researchers reconstitute and store it, typical vial sizes, and what to check on a certificate of analysis.
A tesamorelin 12mg vial is a single lyophilized vial containing 12 milligrams of tesamorelin acetate, sold as a bulk research fill rather than an approved clinical dosage form. The FDA-approved prescription products, Egrifta and Egrifta SV, are supplied in roughly 1 mg and 2 mg single-use vials for one narrow indication. The 12mg size therefore exists almost entirely in the research-peptide market, where it is sold to laboratories and not as a finished medicine.
Tesamorelin is a synthetic analog of growth hormone-releasing hormone (GHRH). The FDA approved it in 2010 to reduce excess abdominal fat in adults with HIV-associated lipodystrophy. It is not approved for general weight loss, bodybuilding, or anti-aging use, and it is not a replacement for diet, exercise, or prescribed therapy.
What Is Actually Inside a 12mg Vial
A 12mg tesamorelin vial usually contains a single sterile-filtered, freeze-dried cake of tesamorelin acetate and nothing else. The 12 mg figure describes the total peptide mass in the vial, not the amount of material in any single measurement.
- Peptide content: 12 mg of tesamorelin acetate as a lyophilized powder.
- Diluent: normally sold separately, most often as bacteriostatic water or sterile water in its own vial.
- Container: a small clear glass vial with a rubber stopper and aluminum crimp seal.
- Documentation: a certificate of analysis (COA), if the vendor supplies one.
Because the powder is freeze-dried, it tolerates shipping far better than a liquid. Long-term stability depends on storage conditions, so the vial should stay cold, dry, and out of direct light until it is reconstituted.
Tesamorelin Vial Sizes Compared
A 12mg vial sits in the middle of the range that vendors typically stock. Larger fills lower the cost per milligram, but they also require the material to be handled and used before it degrades.
| Fill Size | Typical Format | Common Buyer Profile | Considerations |
|---|---|---|---|
| 5 mg | Single lyophilized vial | Small pilot work | Highest cost per mg |
| 10 mg | Single vial or part of a multipack | Repeat buyers | Often bundled as a tesamorelin 10 vial kit |
| 12 mg | Single lyophilized vial | Mid-size studies | Balanced price and shelf-life |
| 15–20 mg | Single lyophilized vial | Larger batch work | Requires faster use after reconstitution |
| 100 mg | Bulk powder, sometimes split across vials | Wholesale or lab scale | Rarely a single 12 mg-style unit |
Buyers who compare a tesamorelin 10mg vial with a 12mg vial are usually weighing a small price difference against convenience. The 2 mg difference matters mainly in how the powder is divided after reconstitution.
Reconstitution Math for a 12mg Vial
Reconstitution is arithmetic, not pharmacology. Dividing 12 mg by the milliliters of diluent added gives the concentration, and every later measurement is calculated from that single number.
| Diluent Added | Concentration | What 0.1 mL Contains |
|---|---|---|
| 3 mL | 4 mg/mL | 0.4 mg |
| 6 mL | 2 mg/mL | 0.2 mg |
| 12 mL | 1 mg/mL | 0.1 mg |
Concentration is determined only by the volume of diluent added, so the same diluent volume produces different concentrations from a 10mg and a 12mg vial. Keep written records of every preparation. Dosing decisions belong to a licensed clinician, and nothing in this article is a dosing recommendation.
Storage, Handling, and Stability
- Keep lyophilized powder refrigerated at 2–8°C, protected from light and moisture.
- Avoid repeated temperature swings, which can introduce condensation into the vial.
- Swab the stopper with alcohol before every needle entry and use sterile technique.
- Refrigerate reconstituted solution at 2–8°C and follow the vendor's or COA's stated window, which is usually a few weeks.
- Do not refreeze a reconstituted solution.
Freeze-dried tesamorelin powder is considerably more stable than a reconstituted solution, which is why nearly every vendor ships it dry. Once liquid is added, the clock starts.
How a 12mg Vial Fits Into Broader Peptide Research
Tesamorelin is one entry in a crowded field of growth-hormone-related peptides, and researchers frequently compare it with neighboring compounds. A common starting point is cjc-1295 ipamorelin vs tesamorelin, which contrasts a GHRH analog with a ghrelin-receptor agonist. A wider comparison is tesamorelin vs sermorelin vs cjc-1295, since all three act on the GHRH pathway but differ in half-life and molecular structure.
| Peptide | Primary Mechanism | FDA Status |
|---|---|---|
| Tesamorelin | GHRH analog | Approved as Egrifta/Egrifta SV for HIV lipodystrophy |
| Sermorelin | GHRH analog (1–29 fragment) | Brand discontinued; not approved as a research chemical |
| CJC-1295 | GHRH analog with drug affinity complex | Not FDA approved |
| Ipamorelin | Ghrelin receptor agonist | Not FDA approved |
| AOD-9604 | HGH fragment 176–191 | Not FDA approved |
Blend products are also common. Someone researching a cjc 1295 ipamorelin tesamorelin stack is usually looking at how GHRH signaling and ghrelin signaling overlap, while a study pairing aod 9604 with tesamorelin focuses on fat metabolism rather than GH release. Stacking peptides is not automatically safer or more effective, and interactions between research compounds are poorly documented.
What to Check Before Buying
- Independent testing: third-party HPLC purity and mass spectrometry confirmation, not just a vendor's own claim.
- Lot matching: the lot number on the vial must match the lot number on the COA.
- Sterility and endotoxin data: relevant for any vial intended for laboratory work.
- Price per milligram: a 12mg vial at a low total price can still be expensive per mg.
- Cold-chain shipping: insulated packaging with gel packs, especially in summer.
A certificate of analysis from an independent laboratory is the only meaningful evidence of peptide purity available to a retail buyer. Marketing language and customer reviews are not substitutes for analytical data.
Safety and Legal Considerations
Tesamorelin is a prescription drug in the United States, and only the FDA-approved versions are legal to dispense for human use. Research vials sold online are not approved medicines, and their contents, sterility, and potency are not verified by any regulator.
Reported side effects of prescription tesamorelin include injection-site reactions, joint pain, swelling, and changes in blood sugar. Anyone considering tesamorelin for a medical purpose should talk with a healthcare professional about risks, monitoring, and whether an approved product is appropriate.
Frequently Asked Questions
Is a tesamorelin 12mg vial the same as Egrifta?
No. Egrifta and Egrifta SV are FDA-approved prescription products supplied in roughly 1 mg and 2 mg single-use vials for HIV-associated lipodystrophy. A 12mg vial is a research-market fill size and is not an approved medicine.
How much bacteriostatic water should be added to a 12mg tesamorelin vial?
Common practice is 3 to 6 mL, which produces concentrations of 4 mg/mL to 2 mg/mL. The right volume depends on the concentration a protocol calls for, and more diluent always means a weaker solution.
How long does reconstituted tesamorelin last?
Reconstituted solution should be refrigerated at 2–8°C, protected from light, and used within the window stated by the vendor or COA, which is usually a few weeks. Freeze-dried powder stored cold and dry remains stable far longer.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.