Acetyl L Carnitine 750 Acetyl L Carnitine 500mg Amino Acid Supplement Nature's Best Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn Acetyl L Carnitine is a modified form of carnitine that has the dual benefit of supporting mental fatigue, improving mood levels and alertness as it crosses the blood brain barrier with ease while supporting Amazon.com: NOW Foods Supplements, Acetyl L Carnitine 500 mg, Amino Acid, Brain And Nerve Cell Function*, 50 Veg Capsules : Health & Household