Studied, but not stocked. Axyn Peptides keeps a working knowledge of the wider research-peptide landscape so we can answer questions accurately and point researchers to the published literature. The compounds below are studied in that literature but are not stocked or sold by Axyn. Listing them here is strictly education. It describes no use and implies none.
Why we share this but do not sell it
Some compounds sit on a different regulatory footing from the research materials we supply. Several are the active ingredient of a licensed medicine, or are the subject of active regulatory enforcement, or are prescription-only medicines in the UK. Others are simply an area of high regulatory scrutiny where we choose not to trade. In every case the reasoning is the same: keeping the material off our range is the correct position, and pretending the science does not exist helps no one. So we keep the knowledge, share the context, and do not sell the compound.
A recurring theme below is the UK regulator’s two-limbed test for what counts as a medicine. A product can be a medicine by presentation, because of how it is described or marketed, and a product can be a medicine by function, because of what it actually does in the body. Either limb is enough. That test is one reason several of the compounds here stay off a research-materials catalogue.
The compounds we do not stock
Semaglutide
An approved GLP-1 receptor agonist studied in metabolic research. As the active of a licensed medicine under active MHRA enforcement, it is not stocked.
Tirzepatide
An approved dual GIP/GLP-1 receptor agonist studied in metabolic research. Named alongside retatrutide in MHRA enforcement activity; not stocked.
SS-31 (Elamipretide)
A cardiolipin-targeting mitochondrial tetrapeptide studied in mitochondrial biology and now an approved rare-disease medicine active; not stocked.
PT-141 (Bremelanotide)
A melanocortin receptor agonist studied in sexual-function research and an approved medicine (Vyleesi). Its approved-drug status keeps it off the range.
Melanotan II
A melanocortin analogue studied in pigmentation research. The MHRA has an active published warning treating it as an unlicensed medicine; not stocked.
HCG
A glycoprotein hormone, not a synthetic peptide, and a UK prescription-only medicine. A different regulatory footing entirely; not stocked.
DSIP
A naturally occurring nonapeptide studied in sleep and neuromodulation research, mechanism unresolved; not stocked.
Cagrilintide
A long-acting amylin analogue studied in metabolic and weight-management research; a GLP-1-adjacent, high-scrutiny area, not stocked.
Thymosin alpha-1
A 28-residue immunomodulatory peptide studied in immune research and approved as a medicine in some markets; not stocked.
Kisspeptin-10
A reproductive neuropeptide studied in neuroendocrine research (GnRH-release biology); not stocked.
Everything on this page is provided for research context only. None of these compounds is offered for sale by Axyn Peptides, and nothing here describes or implies any use in or on the body. To see what we do supply, browse the catalogue or read our testing standard.
For research use only. Not for human consumption. Not a medicine, supplement or cosmetic. No therapeutic use is stated or implied.