L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians 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 L Carnitine has become one of the most commonly asked about supplements over the past 18 months and I can see why when looking at all the research that has come out about it over the last 2ish years., Amazon.com: ProSupps L Carnitine Liquid 3000, Stimulant Free Liquid Shots for Men & Women Clean Workout Drink for Energy, Performance & Muscle Recovery No Sugar, No Carbs 31 Servings, Blue Razz :