From increased energy to better sleep and improved brain function, this amino acid can tackle a lot. Because acetyl L carnitine can pass through the semi permeable membrane around your brainthe blood brain barrier ( Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Acetyl L Carnitine Functions & Benefits Bulk Nutrients Benefits of Acetyl L Carnitine Simply Supplements