Ronnie Coleman L Carnitine XS 3,000 mg Liquid Ronnie Coleman Signature Series What even is carnitine?? Carnitine is a "conditionally" essential amino acid that becomes essential during pregnancy. What does this mean? You must get carnitine through food! The best sources are red L Carnitine 3000 16.5oz Liquid Musclesport L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid. Amazon.com: NOW Foods Supplements, L Carnitine 1,000 mg, Purest Form, Amino Acid, Fitness Support*, 100 Tablets : Health & Household Carnitine: the claims and why it may not work