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Afamelanotide, MT-I, [Nle4-D-Phe7]-α-MSH, Scenesse, CUV-1647
A synthetic analog of alpha-melanocyte-stimulating hormone that stimulates melanogenesis, increasing skin pigmentation and providing photoprotection against UV radiation.
van der Kraan. M M; Adan. R A RA; Entwistle. M L ML; Gispen. W H WH; Burbach. J P JP; Tatro. J B JB
The study shows that the MC5 receptor, which melanotan‑I can activate, is found in many secretory glands like tear, prostate, pancreas and adrenal glands in rats, meaning the peptide could affect hormone release, immune function and body temperature, not just skin color.
Spaccapelo. Luca L; Galantucci. Maria M; Neri. Laura L; Contri. Miranda M; Pizzala. Roberto R; D'Ami...
In a rat-like brain injury model, giving the peptide melanotan‑I (a synthetic version of the hormone α‑MSH) helped brain cells grow back and improved memory. It worked by turning on two important cell‑growth pathways (Wnt‑3A/β‑catenin and Sonic hedgehog) and raising helpful proteins like IL‑10. Blocking those pathways stopped the benefits, showing they are essential for the effect.
Colombo. Gualtiero G; Gatti. Stefano S; Turcatti. Flavia F; Sordi. Andrea A; Fassati. Luigi R LR; Bo...
In a rat heart‑transplant model, a synthetic version of the peptide alpha‑melanocyte‑stimulating hormone (called NDP‑alpha‑MSH) helped the transplanted hearts survive longer by turning on genes that protect cells and turning off genes that drive inflammation and immune attack.
Chhajlani. V V; Xu. X X; Blauw. J J; Sudarshi. S S
The study shows that certain parts of the skin‑color receptor (MC1R) are crucial for the peptide melanotan‑I to stick to it. Changing specific amino acids, especially Asp184, stops the peptide from binding, while other changes weaken the connection.
Haskell-Luevano. C C; Hendrata. S S; North. C C; Sawyer. T K TK; Hadley. M E ME; Hruby. V J VJ; Dick...
Scientists found that very short peptide fragments (four‑ or three‑amino‑acid pieces) can stick to and activate two skin‑related receptors, MC1R and MC4R, but they do so only at relatively weak (micromolar) levels. This shows the basic building blocks can work, but the compounds aren’t potent enough yet for practical use.
Schiöth. H B HB; Muceniece. R R; Wikberg. J E JE
This lab study measured how tightly melanotan‑I and related peptides stick to the human MC4 receptor, a brain protein that helps control appetite and metabolism. It found melanotan‑I binds the strongest, with a high affinity (Kd ~3.8 nM), and that the MC4 receptor prefers beta‑MSH over other natural peptides, while ignoring gamma‑MSH. The results mainly clarify the receptor’s binding profile, not how the peptide works in people.
Wu. Xuan X; Fu. Siming S; Liu. Yun Y; Luo. Hansheng H; Li. Feng F; Wang. Yiying Y; Gao. Meng M; Chen...
In a mouse model of brain bleed, giving the peptide NDP-MSH (also called melanotan‑I) right after injury helped the animals recover better. It lowered brain swelling, reduced inflammation, and kept the blood‑brain barrier more intact by turning on a chain of signals (CREB → Nr4a1 → less NF‑κB activity). The benefits disappeared when the researchers blocked the receptor (MC1R) or a downstream protein (Nr4a1).
Jiang. J J; Sharma. S D SD; Nakamura. S S; Lai. J Y JY; Fink. J L JL; Hruby. V J VJ; Hadley. M E ME
In lab tests, the synthetic peptide melanotan‑I (a strong melanin‑stimulating hormone) sometimes boosted the melanin‑making enzyme in melanoma cells and consistently slowed down their growth, even after the peptide was removed. However, these results are from cell cultures, not humans, so they don’t give clear guidance for personal use.
Blanchard. S G SG; Harris. C O CO; Ittoop. O R OR; Nichols. J S JS; Parks. D J DJ; Truesdale. A T AT...
The study shows that the natural agouti protein can block the same receptors that melanotan‑I activates, doing so in a competitive way with very high potency. This means that if a person has high levels of agouti (due to genetics or other factors), it could reduce how well melanotan‑I works, but the research was done in mouse melanoma cells and doesn’t give direct dosing advice.
Hadley. M E ME; Abdel Malek. Z A ZA; Marwan. M M MM; Kreutzfeld. K L KL; Hruby. V J VJ
The study shows that the peptide melanotan‑I (a modified alpha‑MSH) is about 100 times stronger than the natural hormone at turning on an enzyme called tyrosinase in melanoma cells, and this activation sticks around for days even after the peptide is removed. This means the drug can cause long‑lasting skin‑pigment changes and might keep melanoma‑related pathways active for a long time.
Kobobun. K K; O'Donohue. T L TL; Handelmann. G E GE; Sawyer. T K TK; Hruby. V J VJ; Hadley. M E ME
The study shows that melanotan‑I (a modified alpha‑MSH) triggers the same grooming behavior as the natural hormone but actually worsens performance on a visual learning test, suggesting it might block brain receptors involved in attention and memory.
Labbé. O O; Desarnaud. F F; Eggerickx. D D; Vassart. G G; Parmentier. M M
Scientists cloned a mouse version of the MC5 receptor, which is a protein that responds to melanocortin peptides like alpha‑MSH (the natural hormone that melanotan‑I mimics). This receptor is found in many body parts—not just skin—such as muscle, adrenal gland, bone marrow and brain, and it activates cellular signaling pathways when it binds the hormone.
Dawson. B V BV; Hadley. M E ME; Kreutzfeld. K K; Dorr. R T RT; Hruby. V J VJ; Al-Obeidi. F F; Don. S...
Scientists showed that a powerful melanin‑boosting peptide can pass through mouse skin when applied in a gel, staying active enough to darken skin cells, but it didn’t work on rat skin in the same lab test. This proves a peptide can be delivered through skin in theory, but the results are species‑specific and still far from a ready‑to‑use product for people.
Frändberg. P A PA; Muceniece. R R; Prusis. P P; Wikberg. J J; Chhajlani. V V
The study shows that the synthetic peptide melanotan‑I (a D‑isomer version of alpha‑MSH) binds to the skin‑color receptor (MC1R) in a different way than the natural L‑form, meaning it still works even when certain receptor spots are changed. This explains why melanotan‑I is a strong activator and may work across different people, but it doesn’t give new dosing tips or safety data.
Hadley. M E ME; Mieyr. J H JH; Martin. B E BE; Castrucci. A M AM; Hruby. V J VJ; Sawyer. T K TK; Pow...
The study shows that the peptide melanotan‑I (a modified alpha‑MSH) is a very strong and long‑lasting activator of pigment cells in many animal species, meaning it can cause sustained skin darkening with fewer doses. However, the research is all in frogs, lizards, snakes and fish – there’s no human data, safety info, or guidance on dosing for health or performance purposes.
Holdeman. M M; Lipton. J M JM
The study shows that giving the peptide melanotan‑I directly into the brain of rabbits cuts fever about ten times better than the natural hormone, but giving it into the bloodstream does almost nothing because it doesn’t cross into the brain well. For most people, especially DIY users, this means the peptide isn’t a useful fever‑breaker when taken by normal routes like injection under the skin or orally.
Versteeg. D H DH; Florijn. W J WJ; Holtmaat. A J AJ; Gispen. W H WH; De Wildt. D J DJ
In rats, injecting certain ACTH/Melanotan‑I‑like peptides directly into the brain raised blood pressure at the same time they caused the animals to groom a lot. Peptides that didn’t trigger grooming barely changed blood pressure. Blocking dopamine signals or getting tolerant to the peptide stopped both effects, suggesting the two are linked.
Raible. L H LH; Knickerbocker. D D
In rats, injecting alpha‑melanocyte‑stimulating hormone (MSH) or its strong version NDP‑MSH straight into a brain area that controls temperature makes the animals get hotter. The effect grows with higher doses, and certain short pieces of the peptide (the 4‑10 and 7‑13 fragments) also raise temperature, while the 1‑7 piece does not.
Vinson. G P GP; Whitehouse. B J BJ; Bateman. A A; Hruby. V J VJ; Sawyer. T K TK; Darman. P S PS
The study tested two synthetic versions of the hormone alpha‑MSH on rat adrenal cells that make aldosterone. The cyclic version ([Cys4,Cys10]-alpha‑MSH) directly activated these cells just like natural alpha‑MSH, while the other version ([Nle4,D‑Phe7]-alpha‑MSH) only boosted the response when natural hormone was already present. This suggests that some melanotan‑I‑like peptides could affect adrenal hormone release, but the work is in rats and not directly transferable to humans.
Shafir. I I; Schmidt-Sole. J J; Shai. E E; Salomon. Y Y
The study examined how a super‑potent MSH analogue binds to its receptor in mouse melanoma tumors and found the receptor‑peptide complex is very stable at neutral‑to‑slightly basic pH but falls apart in acidic conditions, and that calcium helps keep it together. It also showed the complex resists some proteases and can be chemically cross‑linked, but the work is basic receptor biology, not a human dosing or safety trial.