- MyoPures™ Acetyl-l-carnitine meets the British Pharmacopia standard and is greater than 98% pure. MyoPures™ Acetyl-L-Carnitine (ALCAR) is an acetylated form of L-Carnitine which is up to 4 times more bioavailable than L-Carinitine base. Research suggests that supplementing with ALCAR may be beneficial in a number of areas including exercise performance, weight loss, and in enhancing brain function.