acetyl l carnitine structure DL-Carnitine | C7H15NO3 | CID 288 Carnitine - Wikipedia

doi: 10.1155/2014/608512 114 KmetOFilipetsNKmetTHrachovaTVepriukY

it is not approved for human use

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Chemically it is the product of deliberate optimisation: first the minimal active fragment of angiotensin IV was identified the tripeptide Nle-Tyr-Ile and then stabilised into an orally usable molecule

J Mol Neurosci 72(8):16091621

But, its also used in weight loss treatments