HGH Somatropin Pen 36 IU — reference profile

What this compound is

Somatropin is recombinant human growth hormone: a 191-amino-acid polypeptide with the same sequence as the pituitary-derived hormone. At roughly 22 kDa it is a protein rather than a short peptide, and it is produced by recombinant expression rather than chemical synthesis.

Molecular profile

Composition: Recombinant 191-amino-acid polypeptide. Molecular weight ≈ 22 125 Da.

Molecular weight is the figure used to confirm identity by mass spectrometry: the measured mass is compared against the value calculated from the sequence, and agreement within instrument tolerance is what establishes that the material is the intended molecule rather than merely a pure one.

What published research has examined

Research concerns the growth-hormone axis, induction of IGF-1, and body-composition and metabolic endpoints. Strength is stated in international units alongside mass, because activity rather than weight is the conventional measure for this class.

This is a description of what has been studied, not a claim about outcomes and not a suggestion that anyone should use it. Research findings in cell culture or animal models do not transfer directly to any other setting.

Format and handling

Pen format. The compound is the same as the vial presentation; the difference is the delivery device, not the chemistry.

Supplied as a white lyophilized powder. Proteins of this size are more sensitive to agitation and to freeze-thaw cycling than short peptides are.

Storage conditions and the expiry date on the label describe material kept as specified. A vial left at ambient temperature has not been stored as specified, whatever the date says.

Documentation and verification

Each batch carries a Certificate of Analysis stating purity, identity and the methods used. The outer box carries a printed RVL code which resolves against production records and returns the item, strength, batch number and dates.

The batch number should read the same on the vial, on the box and on the certificate. Where it does not, treat the material as undocumented until the discrepancy is explained.