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 The Benefits (and Limitations) of L Carnitine for Fat Loss Amazon.com: Acetyl L Carnitine 1,000mg Per Serving, 150 Capsules (ALCAR for Brain Function Support, Memory, Attention, and Stamina) Acetyl L Carnitine that is Third Party Tested by Double Wood : Everything Else Compounded Carnitine (L) Injection Empower Pharmacy L Carnitine is Underrated. New Meta Review Reminds Us Why.