HGH (Somatropin)

Human Growth Hormone · Somatropin

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Overview

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.

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.

Mechanism

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

Research areas

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.
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.

Research notes

Water retention and fluid accumulation
Joint pain and stiffness
Carpal tunnel syndrome (usually resolves with dose reduction)
Numbness/tingling in hands
Severe or worsening carpal tunnel symptoms

Pharmacokinetics

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.

References

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.