What HGH is
Growth hormone is a 191 amino acid protein produced in the anterior pituitary. Recombinant somatropin reproduces that sequence exactly, which is what 191aa refers to. It is a protein rather than a short peptide, and it is dosed in international units with a stated mass conversion: 100 iu is 33.3 mg, 30 iu is 10 mg.
How the pen is supplied
Solution in a sealed 3 ml pen graduated in 300 dial units, held at two strengths. Supplying it made up removes the reconstitution step that lyophilised somatropin normally requires.
Pen specification
| Class | Recombinant human growth hormone, 191 amino acids |
| Also known as | Somatropin, Growth hormone, 191aa |
| Content | 100 iu |
| Fill volume | 3 ml |
| Dial graduation | 0.01 ml per unit |
| Total dial units | 300 |
| Per dial unit | 0.33 iu |
| Cost per iu | £1.65 per iu |
Milligrams per dial unit and cost per milligram are calculated from the pen strength, its fill volume and the current live price. Every SerenQ pen is graduated at 0.01 ml per unit.
Verification
Independent assay per batch, identifier printed on the pen.
- SerenQ HGH 100iu Peptide Penin stock£165
Availability checked 2026-09-04. The product page carries live stock.
Common questions
What does 191aa mean?
The full 191 amino acid sequence of human growth hormone, reproduced exactly by the recombinant protein.
How do iu and mg relate here?
100 iu corresponds to 33.3 mg and 30 iu to 10 mg, as stated on the product specification.
How does this differ from a secretagogue?
This is the hormone itself. A secretagogue such as ipamorelin or sermorelin acts on the pituitary to influence its own release.