Research Reference
HGH (Somatropin, 191aa)
Recombinant human growth hormone (191 amino acids) for growth deficiency
Research & educational purposes only. BioMaxFit does not sell, promote, or represent peptides in any way. We are strictly educational and recommend working with your doctor on anything health-related. The information below comes from published research and documents what has been studied, not what should be done. Many of these compounds are investigational and not approved by the FDA; possession or use outside an authorized clinical trial may be illegal in your jurisdiction. This is not medical advice.
Somatropin is recombinant human growth hormone (191 amino acids) FDA-approved for growth hormone deficiency and certain conditions; '191aa' denotes the full-length sequence identical to native HGH. Non-prescription use for enhancement is not approved and carries significant risks.
Dosing Reference
Reconstitution
Add 5 mL bacteriostatic water to the 5 mg vial. Resulting concentration: 1 mg/mL.
| Dose | Syringe Units | mL Volume | Schedule |
|---|---|---|---|
| 1 mg | 100 units | 1 mL | SubQ, dailyAdult GHD (FDA, ~0.3 IU/kg/wk) |
| 2 mg | 200 units | 2 mL | SubQ, dailyAdult GHD higher (FDA) |
| 0.3 mg | 30 units | 0.3 mL | SubQ, dailyPediatric GHD (mcg/kg/day) |
Math assumes U-100 insulin syringes (1 mL = 100 units). Verify your syringe matches before use. Round half-units to the nearest visible mark.
Reconstitution
Somatropin (recombinant human growth hormone, 191 amino acids) is FDA-approved for pediatric growth hormone deficiency, adult GHD, Turner syndrome, Prader-Willi, SGA, ISS, and wasting syndromes (Genotropin, Humatrope, Norditropin, Omnitrope, Saizen, Zomacton). It is supplied as a lyophilized vial or pre-filled pen reconstituted per manufacturer directions to a fixed concentration (typically 1, 2, 5, or 10 mg/mL). Compounded research-peptide forms are not FDA-approved.
For a 5 mg vial reconstituted with 5 mL, the concentration is 1 mg/mL; a 1 mg dose draws to 100 units (1 mL) on a U-100 syringe. For a 10 mg vial reconstituted with 10 mL, the concentration is 1 mg/mL; a 1 mg dose draws to 100 units (1 mL). Gently swirl — do not shake — and store refrigerated. Compounded forms are not FDA-approved.
Cycling Protocol
FDA-approved somatropin is dosed daily (or weekly for some long-acting formulations) as chronic therapy for the indicated condition; dosing is individualized by weight/indication. No fixed cycle end; used long-term under endocrinology supervision.
Routes of Administration
Subcutaneous injection (primary FDA-approved route): Once daily into the abdomen, thigh, or buttock; rotate sites.
No oral route is established (peptide). Compounded forms are not FDA-approved.
Stacking Protocols
| Stack | Components | Purpose | | --- | --- | --- | | GHD replacement | Somatropin + endocrinology monitoring | Standard FDA-approved GHD protocol | | Bodybuilding (off-label, not established) | Somatropin + insulin / AAS | Community anabolism stack (not FDA-approved, significant risk) |
Off-label somatropin use for bodybuilding/anti-aging is not FDA-approved and carries significant risk. Compounded forms are not FDA-approved.
Side Effects & Safety
- Injection-site reactions — common
- Fluid retention, edema — common
- Arthralgia, myalgia — common
- Headache — common
- Insulin resistance / hyperglycemia — risk, monitor glucose
- Carpal tunnel syndrome — possible
- Intracranial hypertension — rare; report severe headache/vision changes
- Lipodystrophy at injection sites — rotate sites
Somatropin is FDA-approved for specific indications under endocrinology supervision. Off-label use (bodybuilding/anti-aging) is not FDA-approved and carries significant risk. Compounded research-peptide forms are not FDA-approved.
Research Basis
Somatropin is recombinant human growth hormone (191 amino acids, identical to endogenous hGH), FDA-approved (multiple brands).
Mechanism: Binds the growth hormone receptor to stimulate IGF-1 production and direct metabolic effects — linear growth, protein anabolism, lipolysis, and carbohydrate metabolism.
Clinical evidence: FDA-approved for pediatric growth hormone deficiency and multiple growth disorders, adult GHD, Turner syndrome, Prader-Willi, SGA, ISS, and wasting syndromes (HIV). Extensive clinical experience.
FDA-approved for the indications above under endocrinology supervision. Off-label use (bodybuilding/anti-aging) is not FDA-approved. Compounded research-peptide forms are not FDA-approved.