Protocol
HGH · hGH · somatropin · somatotropin · human growth hormone therapy · recombinant human growth hormone · rhGH
The human evidence for somatropin as an anti-ageing intervention is unusually well characterised, and it is not supportive. The definitive synthesis is Liu et al., a systematic review of 31 randomised controlled trials of GH in healthy elderly adults (Annals of Internal Medicine, 2007). It found small body-composition shifts (fat mass down about 2.1 kg, lean body mass up about 2.1 kg) with no demonstrated gain in strength, function, quality of life or survival, and significantly higher rates of soft tissue oedema, arthralgia, carpal tunnel syndrome, gynaecomastia, and new-onset diabetes or impaired fasting glucose. The authors concluded GH cannot be recommended as an antiaging therapy. Nothing since has overturned that: the frequently cited TRIIM trial (Fahy et al., Aging Cell, 2019) reported thymic regrowth and a roughly 1.5 to 2.5 year reduction in epigenetic age, but it enrolled only nine men, had no control arm, and combined rhGH with DHEA and metformin, so no effect can be attributed to GH alone and no clinical outcome was measured. Separately, the benefit in genuinely GH-deficient adults (pituitary disease, hypopituitarism) is real and is the basis of the registered indication, but that population is not the ageing population these clinics are marketing to. There is also a documented harm signal in the other direction: lower GH/IGF-1 signalling is associated with longer life in multiple model organisms and in human GH-receptor-deficiency cohorts, so the mechanistic rationale for supplementing GH to extend healthspan is contested rather than merely unproven. Chronic supraphysiological GH causes acromegaly, insulin resistance, and cardiovascular disease. Even the Singapore clinic pages advertising the treatment state plainly that HGH is not the anti-ageing miracle it is claimed to be.
Singapore
Australia
What it is
Somatropin is recombinant human growth hormone, a biosynthetic copy of the pituitary hormone, given as a subcutaneous injection (typically daily, with newer long-acting analogues weekly). It is a registered prescription medicine in both Singapore and Australia for diagnosed growth hormone deficiency and a small number of named paediatric growth disorders. In the longevity market it is promoted off-label to older adults on the claim that restoring youthful GH and IGF-1 levels increases lean mass, reduces fat mass, improves bone density, energy and recovery, and slows biological ageing.
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