"The real growth hormone (somatropin) which is identical to the human body’s own GH has a 191 amino acid sequence molecule.
There is a cheaper method to create something called somatrem (or Met-GH) – a 192 amino acid sequence GH, which is technically not a real GH, and is not natural to the human body – but does work similar. Met-GH has an additional methionyl amino acid attached which can cause a person’s body to build up antibodies against it. It can also cause allergic reactions – some people built up so much resistance that the immune system neutralized the effect of the drug. This is especially dangerous because it can leave permanent damage – immune system attacking person’s own, real GH.
I have heard reports of several cheap GH brands (somatorm, nomad labs, etc.) which leave painful red welts on injection spot. There are two reasons something like this can happen – either the substance is fake or it has bacterial residue in it, which causes an immune reaction.
When it comes to their health, most people want only the best but some seem to not care and are looking for anything cheap."