Acetyl L-carnitine

Acetyl L-carnitine is a chemical compound, acid ester of carnitine, an amino acid derivative of the amino acids lysine and methionine.
Carnitine. See https://www.tiiips.com/m/tiiips/home?action=viewObject&oID=23389

What it is used for and where
Cosmetics

Skin conditioning agent - Miscellaneous. This ingredient has the task of modifying the condition of the skin when it is damaged or dry by reducing its flakiness and restoring its elasticity.
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CAS: 14992-62-2