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Growth recoveryIn StockSubQ injection

HGH 191 AA (97%)

Polypeptide · Somatotropin sequence · 191 amino acids

Half-life

~2-3h

After administration

Delivery Method

SubQ injection

Route of administration

Storage (Lyophilised)

12-24 months

room temp after first use depending on b

Storage (Reconstituted)

4–6 weeks

Refrigerate at 2-8C

Known For

Recombinant human growth hormone. The 'gold standard' for GH therapy. Promotes muscle growth, fat loss, improved sleep, skin quality, injury recovery, and anti-aging. 191 amino acid sequence identical to natural HGH.

Mechanism of Action

Recombinant human growth hormone — identical to pituitary GH. Directly replaces/supplements endogenous GH.

Body vs. External Supply

🔴 Exogenous (replaces natural)

Brand / Trade Names

Humatrope® (Lilly) Genotropin® (Pfizer) Norditropin® (Novo Nordisk) Saizen® (EMD Serono) Omnitrope® (Sandoz) Multiple generics available

Typical Research Dosage

Anti-aging: 1-2 IU/day. Fat loss: 2-4 IU/day. Muscle growth: 4-6+ IU/day. SubQ or IM. AM or split AM/PM.

Vial Duration Guide

10 IU vial at 2 IU/day = 5 days. 24 IU vial at 2 IU/day = 12 days.

Recommended Vial Size

★ 10 IU or 12 IU vials At 2 IU/day, 10 IU = 5 days ✓, 12 IU = 6 days ✓. Small vials ensure fresh product. 24 IU at 2 IU/day = 12 days ✓ (also fine).

Time to Effects

EARLY: 2-4 weeks FULL: 3-6 months Week 1-2: Improved sleep quality (often the first noticeable effect). Mild water retention. Week 2-4: Better recovery from training. Skin may start looking fuller/healthier. Increased energy. Month 2-3: Fat loss becomes visible (especially abdominal). Improved body composition. Joint and injury recovery. Month 3-6: Full anti-aging effects — skin quality, hair, nails, muscle tone, cognitive clarity. Body composition significantly improved. Minimum commitment: 3 months. Optimal: 6-12 months for anti-aging benefits.

Contraindications & Do Not Combine

• Do NOT combine with CJC-1295, Ipamorelin, GHRP-2, GHRP-6, Hexarelin, Sermorelin, or Tesamorelin (exogenous HGH suppresses pituitary — secretagogues become ineffective) • Caution with IGF-1 LR3 (compounded growth factor load — advanced users only) • Monitor blood glucose — HGH causes insulin resistance

Common Side Effects

Joint pain/swelling (30%), edema/fluid retention (20-40%), carpal tunnel (5-15%), insulin resistance, headache, numbness/tingling

Drug Interactions

Insulin (antagonizes — may need dose increase), corticosteroids (mutual interaction), thyroid hormones (may ↑T4→T3 conversion), estrogen (oral estrogen ↓GH response)

Reversibility

⚠️ SUPPRESSES natural GH production. Recovery: 2-12 weeks after cessation depending on duration/dose. Pulsatile secretion may take months to fully normalize.

Key Peer-Reviewed References

All studies are published in indexed journals unless otherwise noted.

• Rudman et al. (1990) NEJM 323(1):1-6 — Landmark HGH & aging study • Liu et al. (2007) Ann Intern Med 146:104-15 — Meta-analysis of HGH in healthy elderly • FDA Approved: Multiple brands (Humatrope, Genotropin, Norditropin) for GHD, short stature • Well-established safety/efficacy profile spanning 40+ years of clinical use

Research Disclaimer

Almost all data is preclinical (animal or in-vitro). No large-scale randomised controlled human trials are available for most compounds on this catalogue. This information is provided for research reference only.

Storage Requirements

Pen cartridges: 2-8°C, up to 28 days room temp after first use depending on brand.

State	Condition	Duration
Lyophilised (sealed)	room temp after first use depending on b	12-24 months
Reconstituted	2-8C	4–6 weeks

Reconstitution Note

Reconstitute with bacteriostatic water (BAC water). Do not shake vigorously -- swirl gently to dissolve. Inject BAC water slowly down the side of the vial to avoid denaturing the peptide.

Video Resources

HGH 191 AA (97%) discussed by researchers & practitioners

Independent educational content from researchers, clinicians, and science communicators. Not affiliated with Pepnerd — provided as supplementary reading.

Educational resources only. The videos above are independent third-party content from researchers, clinicians, and science communicators. Pepnerd is not affiliated with any of these creators and does not endorse or make any claims based on their content. All products are sold strictly for in-vitro scientific research.

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$55.00 per vial

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Quick Reference

Half-life	~2-3 hours (SubQ) \| ~20 min (IV)
Delivery	SubQ injection
Typical dose	1-2 IU/day
Storage (lyoph.)	room temp after first use depending on b
Storage (recon.)	4–6 weeks
Endogenous?	Exogenous (replaces natural)
Suppression	Suppresses endogenous GH
WADA	Prohibited (S2)
FDA status	Approved (various brands)