HGH 191aa (Somatropin)

Growth Hormone SecretagogueResearch Use Only

Also known as: Somatropin, Recombinant human growth hormone, rhGH, Growth hormone 191 amino acid

HGH 191aa, or somatropin, is recombinant human growth hormone identical in sequence to the 191-amino-acid endogenous hormone. It is commonly referenced in research literature examining growth, metabolism, and IGF-1 signaling. This entry is educational and research-use-only and is not medical advice.

Typical range (research)

Commonly referenced in literature in international units, often cited around 1–4 IU per day in research discussions (research reference only)

Half-life

~2–4 hours (biological effects persist longer via IGF-1)

Route

Subcutaneous or intramuscular (research)

Common use

Studied in growth, body-composition, and metabolic research as recombinant growth hormone

Common vial sizes

10 IU

Storage

Lyophilized powder stored refrigerated (2–8 °C) and protected from light; reconstituted solution kept refrigerated and used within the manufacturer-referenced window (commonly a couple of weeks)

Stacking notes

In research discussion sometimes considered alongside IGF-1 analogs; distinct from secretagogues, which stimulate endogenous release

Reported side effects

Fluid retention reported anecdotallyJoint pain reported anecdotallyCarpal-tunnel-type symptoms cited in studiesInsulin sensitivity changes cited in studies

Regulatory note: A controlled prescription drug in Canada and the US; distribution and possession without prescription is restricted. Included here for educational reference only

Calculate a dose →

Dose figures are ranges commonly referenced in research literature, not recommendations or medical advice. Not for human or veterinary use. Consult a licensed physician.