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Acetylcarnitine

Acetyl-L-carnitine, ALCAR or ALC, is an acetylated form of L- carnitine. It is naturally produced by the body, although it is often taken as a dietary supplement. Acetylcarnitine is broken down in the blood by plasma esterases to carnitine which is used by the body to transport fatty acids into the mitochondria for breakdown.

Wiktionary

acetylcarnitine

n. A dietary supplement derived from carnitine.