melanotan 2 freckles and moles A peptide that makes you tan. Sounds great. What could go wrong? When it’s activating your melanocytes to increase pigment in your skin, it may also be causing cancer— melanoma. I’ve had patients have Melanotan II - Wikipedia

From research that I've done on it, I'd expect any nootropic benefits to be secondary to other health benefits

In summary, the carnitine pool is involved in a variety of biological pathways, and maintaining the homeostasis of the carnitine pool helps to enhance the coordination of cell functions so that cells can respond more effectively to changes in the internal and external environments and enhance the adaptability of the body to environmental changes

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Some users cycle on and off seasonally, running full 812 week Melanotan-1 cycle length protocols in late winter or early spring to prepare for summer UV exposure, then discontinuing in autumn as daylight hours shorten