Hormonal Signaling
Hormonal Signaling Research Peptides
Hormonal signaling covers compounds studied for their action on receptor systems that regulate endocrine output rather than on a tissue directly. The grouping is mechanistic, not therapeutic: what these compounds share is a receptor family, not an outcome.
Most of the category is melanocortin. PT-141 (bremelanotide) and the melanotan compounds are analogues acting at melanocortin receptors, a family involved in pigmentation, energy balance and reproductive signalling depending on which receptor subtype is engaged — which is why the published work on them spans areas that look unrelated at first glance. Kisspeptin-10 sits apart from the melanocortins: it acts upstream of the reproductive axis, on the signalling that governs gonadotropin release.
The published record here is preclinical for most of the category, and each product page sets out what its own citations actually establish, including where a compound is discussed far more widely than it has been studied. Every lot is independently assayed with the certificate published in full against the batch code printed on the vial. Supplied strictly for laboratory research use.
In this category: PT-141 · Melanotan II · Melanotan I · Kisspeptin-10
What to check before buying hormonal signaling compounds
Purity is half the number. A purity figure tells you what fraction of the powder in the vial is the compound on the label — it tells you nothing about how much powder is in the vial. A lot can assay at 99.8% purity and still be short against its labelled content.
Both numbers are published for every batch here: purity from HPLC, and measured mass against expected content. Match the batch code printed on the vial to the certificate before you rely on either.
Hormonal Signaling research peptides — common questions
- What is the melanocortin system?
- A family of five receptors, MC1R through MC5R, acted on by peptides derived from proopiomelanocortin. The compounds in this category descend from alpha-MSH research and differ mainly in which receptors they are selective for — which is why they are studied for very different things despite a shared origin.
- PT-141 and the melanotans — which receptor does each favour?
- PT-141, also called bremelanotide, is characterised with selectivity toward MC3R and MC4R. Melanotan I and Melanotan II are studied primarily in relation to MC1R and pigmentation pathways, with Melanotan II carrying the broader receptor profile of the two.
- Is Melanotan I interchangeable with Melanotan II?
- No. Melanotan I, also known as afamelanotide, is a linear analogue; Melanotan II is cyclic. They are separate compounds with separate lots and separate certificates, and research on one does not transfer to the other.
- Where does Kisspeptin-10 sit in this category?
- Upstream of the rest. Kisspeptin signalling at the KISS1 receptor is described as a regulator of gonadotropin-releasing hormone in the hypothalamic-pituitary-gonadal axis, so it belongs to endocrine signalling research rather than to the melanocortin group it shares this page with.
