HGH 191AA (Somatropin)
HGH 191AA refers to recombinant human growth hormone (somatropin) — a 191 amino acid protein identical to the growth hormone naturally produced by the pituitary gland. It is a licensed medicine used for GH deficiency, muscle-wasting conditions, and short stature. It is also widely used off-label for body composition and anti-aging.
Quick facts
- Half-life
- ~2–3 hours (subcutaneous)
- Administration
- Subcutaneous injection / Intramuscular injection
- Primary use
- Growth hormone replacement, body composition, anti-aging
How it works
Somatropin binds to GH receptors throughout the body, stimulating IGF-1 production in the liver and peripheral tissues. IGF-1 mediates most of GH's anabolic effects — promoting protein synthesis, lipolysis, and tissue repair.
Reported benefits
- Direct growth hormone replacement — not a secretagogue
- Significant improvements in lean mass and fat loss
- Enhanced recovery, skin quality, and connective tissue health
- Licensed for GH deficiency, Turner syndrome, and muscle-wasting conditions
Typical dosing protocol
Dosing
Medical: 0.1–0.3 mg/day. Off-label body composition: 1–4 IU/day. Anti-aging: 0.5–2 IU/day
Cycle length
Medical use: ongoing. Off-label: 3–6 month cycles with breaks
Dosing information is for educational reference only. Individual needs vary. Always consult a healthcare professional.
Safety & considerations
Licensed prescription medicine in the UK — must only be obtained and used under medical supervision. Side effects include water retention, carpal tunnel syndrome, joint pain, and insulin resistance. Contraindicated in active cancer. Consult a healthcare professional before use.
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Important: All content is for informational purposes only. Not medical advice. Always consult a qualified healthcare professional before starting any peptide protocol.