HGH 191AA (12IU/4mg)
HGH 191AA is recombinant human growth hormone (191 amino acids). Reconstitute with 1.2mL of bacteriostatic water for a concentration of 10IU/mL (1IU per 10 units).
Reviewed by the AllPeptides.eu Editorial Team·Last reviewed: 2026-06-16
Educational information. Not medical advice, and no efficacy claim is implied. Regulatory approval is not a use recommendation by AllPeptides.eu.
⚠️ For informational/educational purposes only. Not medical advice. We do not sell any products. Self-treatment carries serious risks — consult a healthcare professional. Disclaimer
Research monograph
See the full HGH 191aa encyclopedia page with mechanism, evidence tier, related variants and research context.
How It Works
HGH 191AA binds to growth hormone receptors, stimulating IGF-1 synthesis in the liver. This promotes muscle growth, lipolysis, tissue regeneration, and collagen synthesis.
Quick Start
- Typical Dose: 2–4IU subcutaneously, daily
- Frequency: Daily, morning or split dose
- Storage: 2–8°C after reconstitution
Dosing Table — HGH 191AA 12IU/4mg
Route: Subcutaneous injection | Frequency: Daily
| Week | Dose | Units (per injection) |
|---|---|---|
| 1–4 | 2IU | 20 units (0.20mL) |
| 5–8 | 3IU | 30 units (0.30mL) |
| 9+ | 4IU | 40 units (0.40mL) |
Studies report administration in the morning on an empty stomach or split into 2 doses. Avoid food for 30 minutes after. Concentration: 10IU/mL.
Related compounds
Reconstitution Steps
- Clean the vial stoppers with an alcohol swab.
- Draw up 1.2mL of bacteriostatic water.
- Slowly inject down the side of the vial — do not shake.
- Gently swirl until fully dissolved.
- Store in the refrigerator (2–8°C).
Protocol Overview
- HGH 191AA is a biosynthetic growth hormone identical to the natural form.
- It acts directly on GH receptors throughout the body.
- Results appear gradually over 4–12 weeks.
Dosing Protocol
- Introduction: 2IU/day for 4 weeks.
- Increase to 3–4IU/day based on tolerance.
- Anti-aging: 2–3IU. Athletic performance: 4–6IU.
- Cycle: 3–6 months on.
- Break between cycles: After a cycle (3–6 months), a pause of 8–12 weeks is recommended.
Washout & Cycle Restart
When can I restart?
After a cycle (3–6 months), a pause of 8–12 weeks is recommended.
Minimum wait period: 8 weeks
Storage Instructions
- Lyophilized: -20°C for long-term or 2–8°C for short-term.
- Reconstituted: 2–8°C, use within 21 days.
- Avoid vibration, light, and freeze-thaw cycles.
Important Notes
- Monitor IGF-1, fasting glucose, insulin.
- Contraindicated in active neoplasia.
- May cause fluid retention in the first few weeks.
- Consult an endocrinologist before use.
Potential Benefits & Side Effects
Potential Benefits:
- Increase in muscle mass
- Reduction in body fat
- Improved skin and hair quality
- Enhanced injury recovery
- Improved sleep quality
- Anti-aging effects
Potential Side Effects:
- Fluid retention / edema
- Joint pain
- Carpal tunnel syndrome
- Transient insulin resistance
- Headache
⚠️ Serious Warnings & Long-Term Risks
The following warnings are based on published literature, FDA labels, and post-marketing surveillance. They do not constitute medical advice. Consult a healthcare professional.
Increased neoplasia risk (IGF-1 signaling)
Chronic IGF-1 elevation is epidemiologically linked to increased risk of colorectal, prostate, and breast cancer. Contraindicated in active neoplasia.
📄 Lancet Diabetes Endocrinol 2014; Endocr Rev 2009Cardiomegaly & arrhythmias
Excessive GH/IGF-1 can cause myocardial hypertrophy, dysfunction, and increased cardiovascular risk (acromegaly analogue).
📄 J Clin Endocrinol Metab 2004Insulin resistance & Diabetes Mellitus
GH is counter-insulin. Chronic use may worsen glycemic control or cause type 2 diabetes.
📄 FDA Label — Genotropin®References
- Pfizer Genotropin Prescribing Information — Adult GH deficiency dosing: 0.15–0.30 mg SC daily; maintenance ≤4IU/day.
View Source - Medsafe NZ Omnitrope Data Sheet — SC injection technique, site rotation, 0.15–0.30 mg/day start, titrate to ~1.3 mg/day.
View Source - Growth Hormone Therapy — Molitch ME, et al. J Clin Endocrinol Metab. 2011;96(6):1587-1609.
View Source - HGH Anti-Aging — Rudman D, et al. N Engl J Med. 1990;323(1):1-6.
View Source
Recommended Supplements
L-Arginine + L-Ornithine
ZMA (Zinc + Magnesium + B6)
External Sources & Regulatory Status
Regulatory Approvals
Genotropin® / Norditropin® / others · GH deficiency / Turner / SGA (1985)
Genotropin® / Omnitrope® · GH deficiency (1988)
GH deficiency
GH deficiency
GH deficiency
Approved worldwide (5+ countries)
Educational information. Not medical advice, and no efficacy claim is implied. Regulatory approval is not a use recommendation by AllPeptides.eu.
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