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The Peptide Clinic

Libido and intimacy peptide research

Everything on this page describes laboratory research. Compounds named here are supplied for in-vitro and analytical work by verified researchers only. None is a registered medicine in South Africa, none is approved for human or veterinary use, and nothing on this page is guidance for use in a person.

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This area covers peptides studied for their interaction with the neuroendocrine signalling that sits upstream of reproductive function: the hypothalamic pathways governing gonadotropin release, and the central melanocortin system. The work here is predominantly central rather than peripheral, and that is what separates it from the vascular pharmacology this field is more commonly associated with.

CompoundsPT-141, Kisspeptin-10
The Clinic box with its silver THE Clinic wordmarkResearch peptide cartridge

What the research measures

Gonadotropin signalling

Release of luteinising hormone and follicle stimulating hormone in response to upstream stimulation, measured in animal models and in isolated hypothalamic tissue.

Melanocortin receptors

Which of the five melanocortin receptor subtypes a compound engages. The subtypes sit in different tissues and drive unrelated effects, so selectivity is the central question in this literature.

Central versus peripheral action

Whether an observed effect originates in the central nervous system or in peripheral tissue. In animal work this is separated by route and by mapping where the relevant receptors actually sit.

Axis feedback

Behaviour of the hypothalamic, pituitary and gonadal axis as a whole, since a compound acting at one node changes the signal every other node receives.

Compounds studied in this area

PT-141

Bremelanotide

A synthetic cyclic heptapeptide, structurally a metabolite of an earlier melanocortin analogue, acting at melanocortin receptors in the central nervous system. Being cyclic rather than linear is part of why it resists enzymatic degradation.

Research examines receptor subtype selectivity across the melanocortin family, and the evidence that its mechanism is central rather than vascular. That mechanistic distinction is the finding that separates this line of work from the earlier pharmacology in the field, and it is the reason the compound is studied at all.

Kisspeptin-10

Kisspeptin (112-121)

A ten amino acid fragment of kisspeptin, a neuropeptide encoded by the KISS1 gene that signals through the receptor originally designated GPR54. The fragment retains the receptor binding of the full-length peptide.

Kisspeptin signalling was identified as an obligatory upstream input to gonadotropin releasing hormone neurons, and that finding reorganised how the reproductive axis is understood. Published work covers receptor pharmacology, the timing of pulsatile release, and the response of the axis in both animal models and controlled human studies.

Laboratory handling and storage

Lyophilised peptide is the stable form. It is normally held below freezing and protected from light.

Reconstituted material has a substantially shorter working life than the lyophilised form, and that window is the usual limiting factor in planning an experiment.

Cyclic peptides in this class tolerate handling better than linear peptides of similar length, but they remain sensitive to oxidation, so buffers are normally prepared fresh.

Repeated freeze and thaw cycles degrade peptide integrity, so single-use aliquots are the standard practice.

Handling, reconstitution and disposal are laboratory procedures and should follow the receiving facility's own written procedures and local regulations.