How long does HGH (Somatropin) take to work?
In the first week of HGH (Somatropin), water retention, mild joint stiffness, sleep changes. Around week 4, iGF-1 climbs noticeably. Skin and recovery improvements appear. By week 8, body comp shifts in users training with adequate protein. Response varies between people, this is the commonly reported pattern, not a guarantee.
Week by week
- Week 1: Water retention, mild joint stiffness, sleep changes.
- Week 4: IGF-1 climbs noticeably. Skin and recovery improvements appear.
- Week 8: Body comp shifts in users training with adequate protein.
References
- Growth Hormone Treatment in Adults with Growth Hormone Deficiency (clinical practice guideline) — Molitch ME et al., JCEM, 2011
- The effects of treatment with recombinant human growth hormone on body composition and metabolism in adults with growth hormone deficiency — Salomon F, Cuneo RC, Hesp R, et al., New England Journal of Medicine, 1989
- Effects of human growth hormone in men over 60 years old — Rudman D, Feller AG, Nagraj HS, et al., New England Journal of Medicine, 1990
Pepdex is an editorial reference, not medical advice. Peptides vary in legal and approval status by country, many are research compounds without full human safety data. Talk to a qualified clinician before starting anything.
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Last updated 2026-06-06.