HGH 191aa (Somatropin)

Growth Hormone SecretagogueResearch Use Only

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

Bio-identical human growth hormone (the full 191-amino-acid molecule), the reference all GH peptides are compared against.

Dosing quick reference

research reference

Starting dose

200 mcg once daily (bedtime)

Frequency

Once daily (bedtime)

Typical range

150–500 mcg per day (conservative)

Cycle

8–12 weeks

Titration (step-up)

Increase ~100 mcg per week over 8 weeks as tolerated

Vials are usually labelled in IU: 10 IU ≈ 3.33 mg.

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 →HGH 191aa (Somatropin) on The Peptide Guide →Deeper research reference: literature dose ranges, storage and handling, and where to source in Canada.

Dose figures are ranges commonly referenced in research literature, not recommendations or medical advice. Research-only labeling does not establish that a substance is safe, approved or appropriate for personal use. Consult a qualified healthcare professional about health decisions.