HGH 191AA dosage and protocol
HGH 191AA is recombinant human growth hormone (somatropin) structurally identical to endogenous GH secreted by the pituitary gland. Studied extensively for its effects on body composition (increased lean mass, reduced adipose tissue), metabolism, tissue repair, and anti-aging. Clinical studies demonstrate meaningful improvements in body composition with once-daily subcutaneous administration.
- Vial size: 3.33 mg
- Reconstitution: 3 mL bacteriostatic water
- Concentration: 1.11 mg/mL
- Administration: subcutaneous
Research areas
- Growth Hormone
- Body Composition
- Fat Loss
- Muscle Preservation
- Anti-Aging
- Recovery
Quick start
- Reconstitute: Add 3 mL bacteriostatic water to the 3.33 mg vial → 1.11 mg/mL
- Typical dose: 200 mcg at bedtime, rising weekly toward 500-900 mcg; up to 1,300 mcg in the advanced phase
- Easy measuring: At 1.11 mg/mL, 1 unit = 0.01 mL ≈ 11.1 mcg on a U-100 syringe, so 200 mcg ≈ 18 units and 500 mcg ≈ 45 units
- Storage: Lyophilized at -20°C; refrigerate after mixing and never freeze the solution
Dosing protocol
| Phase | Dose | Frequency | Volume |
|---|---|---|---|
| Week 1 | 200mcg | Once daily (bedtime) | 0.18mL |
| Week 2 | 300mcg | Once daily (bedtime) | 0.27mL |
| Week 3 | 400mcg | Once daily (bedtime) | 0.36mL |
| Week 4 | 500mcg | Once daily (bedtime) | 0.45mL |
| Weeks 5–6 | 600–700mcg | Once daily (bedtime) | 0.54–0.63mL |
| Weeks 7–8 | 800–900mcg | Once daily (bedtime) | 0.72–0.81mL |
| Weeks 9–12 (Advanced) | 1000–1300mcg | Once daily (bedtime) | 0.90–1.17mL |
How it works
HGH 191AA is recombinant human growth hormone (somatropin), the 191-amino-acid protein secreted by the pituitary. It binds the growth hormone receptor on liver, muscle, fat and bone cells, activating JAK2-STAT5 signaling. In the liver this drives production of IGF-1, which mediates much of GH's growth-promoting and anabolic action. GH itself also acts directly on fat tissue to increase lipolysis and opposes insulin action on glucose uptake. Somatropin is FDA-approved, under several brand names, for growth hormone deficiency in children and adults and for conditions including Turner syndrome, Prader-Willi syndrome, short stature after small-for-gestational-age birth, idiopathic short stature, short bowel syndrome and HIV-associated wasting. Use for anti-aging, bodybuilding or athletic performance is not an approved indication, and distribution for those purposes is restricted in the US. In randomized trials of adults with GH deficiency, somatropin increases lean body mass and reduces fat mass. Trials in healthy older adults found similar body-composition shifts but no clear gains in strength or function, with frequent side effects such as fluid retention and joint pain. Long-term safety concerns include effects on glucose metabolism and questions about cancer risk with sustained IGF-1 elevation.
Reconstitution steps
- Draw 3.0mL bacteriostatic water with a sterile syringe
- Inject slowly down the vial wall; avoid foaming
- Gently swirl/roll until dissolved — do not shake vigorously to preserve protein structure
- Label and refrigerate at 2–8°C, protected from light
Storage
Store lyophilized at −20°C (−4°F). After reconstitution, refrigerate at 2–8°C. Critical: avoid freeze–thaw cycles as freezing can denature the protein.
Important notes
- Research use only
- 10 IU vial = 3.33mg somatropin
- Bedtime administration preferred to mimic physiological GH secretion patterns
- Gradual titration (~100mcg per week) minimizes side effects
- Rotate injection sites systematically to prevent lipoatrophy
- HGH must be injected — oral administration is ineffective (degraded in digestive system)
- Monitor for water retention, joint pain, and glucose changes at higher doses
Supplies
- Bacteriostatic water
- Insulin syringes (U-100)
- Alcohol swabs