l Carnitine and Acetyl l carnitine Roles and Neuroprotection in Developing Brain Neurochemical Research Springer Nature Link Thorne Acetyl L Carnitine Dietary Supplement, 500 mg THORNE Acetyl L Carnitine 500 mg Supports Brain Function & Healthy Nerve Sensations in The Hands & Feet* Gluten, Dairy & Soy Free 60 L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Spring Valley Acetyl L Carnitine HCI 400 mg + Alpha Lipoic Acid 200 mg Capsules, 50 Count HSA FSA Eligible Walmart.com