HGH Overview, Dosing & Safety | Peptide Database

HGH (Somatropin)

Human Growth Hormone | Somatropin

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Human Growth Hormone (HGH/Somatropin) is a 191-amino acid polypeptide hormone FDA-approved for pediatric and adult growth hormone deficiency, HIV-associated wasting, and other conditions. It provides both direct and indirect (IGF-1 mediated) anabolic effects.

Binds to GH receptors on target tissues, triggering JAK2-STAT5 signaling pathway. Direct effects include lipolysis, protein synthesis, and metabolic regulation. Indirect effects via IGF-1 promote growth and anabolism. Half-life ~3 hours subcutaneously.

Molecular Data

Research Indications

FDA-approved for idiopathic and organic causes, Turner syndrome, Prader-Willi syndrome, SGA, Noonan syndrome, SHOX deficiency.

FDA-approved for childhood-onset or adult-onset causes (pituitary tumors, surgery, radiation, trauma).

FDA-approved to increase lean body mass and body weight in cachexia.

Significant fat loss especially abdominal/visceral fat over 1-3 months.

Increased muscle mass and improved body composition.

Enhanced exercise recovery and tissue healing.

Improved skin elasticity, texture, and hair/nail growth.

Improved energy, sleep, and quality of life.

Dosing Protocols

Subcutaneous injection is the only effective route. Morning fasted injection maximizes fat-burning potential; evening mimics natural nocturnal GH pulse.

Medical GHD (Starting)

0.15-0.3mg/day (0.5-1 IU)

Once daily

SubQ

Medical GHD (Maintenance)

0.4-0.8mg/day (1.2-2.4 IU)

Anti-Aging/Wellness

1-2 IU/day (0.33-0.67mg)

Body Recomposition

2-4 IU/day (0.67-1.33mg)

Once or twice daily

Performance (Higher Risk)

4-8 IU/day (1.33-2.67mg)

Split twice daily

Reconstitution Instructions

HGH lyophilized powder vial (typically 10 IU or 36 IU)

Bacteriostatic water for injection

Insulin syringes (29-31 gauge)

Alcohol prep pads

1 Allow vial to reach room temperature (15-20 minutes)

2 Clean rubber stoppers with alcohol swab

3 Determine reconstitution volume (typical: 1mL BAC water per 10 IU)

4 Draw bacteriostatic water slowly, removing air bubbles

5 Insert needle at angle, aiming stream at vial wall - not directly on powder

6 Inject water slowly down inside wall, drop by drop

7 Remove needle and gently swirl in circular motion - never shake

8 Allow to sit if cloudy, then swirl again until crystal clear

9 Solution must be crystal clear; discard if cloudy or contains particles

10 Label with reconstitution date and concentration

11 Store refrigerated at 2-8°C; use within 14-28 days

Interactions

What to Expect

Side Effects & Safety

Common Side Effects

Water retention and fluid accumulation

Joint pain and stiffness

Carpal tunnel syndrome (usually resolves with dose reduction)

Headaches

Numbness/tingling in hands

Stop Signs - Discontinue if:

Severe or worsening carpal tunnel symptoms

Signs of diabetes (increased thirst, frequent urination, blurred vision)

Severe edema (facial, hand, or feet swelling)

Severe joint/muscle pain unresponsive to dose reduction

New lumps, masses, or rapidly growing moles

Severe headaches or vision changes

Signs of allergic reaction

Gynecomastia (breast tissue growth in males)

Hypothyroid symptoms (fatigue, weight gain, cold intolerance)

Contraindications

Active cancer (may accelerate tumor growth)

Acute critical illness (increased mortality in ICU patients)

Closed epiphyses in children (for growth promotion)

Pregnancy/breastfeeding

Quality Checklist

Good Signs

White to off-white lyophilized powder or solid cake (not liquid/collapsed)

Crystal clear reconstituted solution with no particles

Intact vacuum in sealed vial (resistance when inserting needle)

Pharmaceutical grade with certificate of analysis (Genotropin, Norditropin, Humatrope preferred)

Warning Signs

Generic/underground lab products have highly variable quality and potency

Common counterfeits exist; third-party testing recommended

Bad Signs

Cloudy, discolored, or particles visible indicates degradation

Powder appears melted or stuck to vial (improper storage)

Yellow/brown coloring

Frequently Asked Questions

Will HGH unmask thyroid problems?

Yes. HGH unmasks central hypothyroidism in 36-47% of users by increasing T4-to-T3 conversion. Get baseline thyroid labs (TSH, free T4, free T3) before starting and recheck at 6-8 weeks. Many users need T4 supplementation while on HGH.

How much carpal tunnel syndrome should I expect from HGH?

Carpal tunnel symptoms are common (10-30% of users) and typically mild to moderate. They usually resolve with dose reduction. Symptoms typically peak at 2-4 weeks and improve as your body adapts. Starting low and titrating up reduces risk.

Does HGH require continuous use or can I cycle it?

HGH effects are dose-dependent and reversible. Most users cycle 3-6 months on, 1-2 months off to maintain sensitivity and allow recovery of natural GH production. Continuous use is possible but may increase side effect risk over time.

Can HGH cause diabetes?

HGH decreases insulin sensitivity, potentially unmasking pre-diabetes or causing diabetes in susceptible individuals. Monitor fasting glucose and HbA1c regularly. Those with family history of diabetes should proceed cautiously and may need metformin support.

References

15,809 patients from the KIMS database, mean 5.3 years follow-up. Adverse events in 51.2% of patients, treatment-related in 18.8%. No correlation between GH dose and adverse event rate. Supports long-term safety of GH replacement in adults with GHD.

Systematic review demonstrating positive effects of GH treatment on cardiovascular disease and fracture risk, improvements in body composition, muscle strength, quality of life, bone mass/density, and lipoprotein patterns.

GH deficiency is associated with several cardiovascular risk factors that significantly increase cardiovascular morbidity and mortality. GH replacement improves cardiovascular risk factors.

In 84 apparently euthyroid patients, 30 (36%) developed hypothyroidism requiring T4 therapy after starting GH. Highest risk in patients with organic pituitary disease or multiple pituitary hormone deficiencies.

Related Peptides

Ghrelin mimetic works via different pathway.

Commonly combined in hormone replacement therapy.

Disclaimer

This information is for educational and research purposes only. Consult a healthcare professional before use.