melanotan 2 toxicity TikTokers can't stop recommending II as a quick hack to getting a tanned summer body without spending any time in the sun. The substance was developed in the 1980s as a Melanotan – What It Is
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DOI: 10.1056/NEJMoa054013

MTNs also exhibit ATP-gated P2X receptor currents, implicating purinergic input in excitatory control (Turman et al., 1999

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The short version: Melanotan I (Afamelanotide) has received FDA/EMA approval for a specific medical condition (erythropoietic protoporphyria) and is more selective for skin pigmentation
More research is needed to understand whether acetyl-l-carnitine can help patients with the less studied aetiologies, such as infections or trauma