Growth hormone (HGH)

Also known as Somatropin, HGH 191AA

Lab-made human growth hormone — identical to the hormone your body makes. A prescription medicine.

Quick facts

Status: Approved medicine in the EU and US
Evidence: Approved (for specific deficiencies)
Taken as: Injection under the skin
Common sizes: Approved as pens and cartridges. "HGH 191AA" vials sold online (e.g. 10 IU) are unregulated.
Category: Hormone · growth

How it works

It tells your liver to make IGF-1, which drives growth, builds muscle and bone and affects how you burn fat.

What it’s used for

Growth hormone deficiency in children and adults (approved)
Some genetic conditions that affect growth (approved)
Muscle and anti-ageing (not approved and not proven)

What the research shows

Well studied for deficiency.
In healthy adults it adds water and some lean mass but doesn't make you stronger.

Side effects & risks

Water retention and swelling
Joint pain and carpal tunnel syndrome
Higher blood sugar
Banned in sport

Is it legal?

Approved prescription medicine in the EU, UK and US for growth hormone deficiency and specific other conditions. Prescription-only medicine. Use only under a doctor's supervision — products sold online as "research" versions are unregulated and not the authorised medicine. Prohibited in sport (WADA Prohibited List).

Storage & safe handling

Only use as prescribed and supervised by a doctor.
Store exactly as described in the patient leaflet.
Use a new sterile needle every time and dispose of it in a sharps container.

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Sources: EMA and FDA product information for somatropin products; WADA Prohibited List.
Last updated 12 October 2026. Information — not medical advice. PepTimer does not replace a doctor. Many peptides are not approved medicines in the EU, UK or US. Talk to a qualified healthcare provider before starting, changing or stopping any treatment.