Acetyl L Carnitine Supplement for Brain Persona From increased energy to better sleep and improved brain function, this amino acid can tackle a lot. Because acetyl L carnitine can pass through the semi permeable membrane around your brainthe blood brain barrier ( Acetyl L Carnitine Cognitive Support RTHM Acetyl L Carnitine Confident Health Amazon.com: THORNE Acetyl L Carnitine 500 mg Supports Brain Function, Mood & Healthy Nerve Sensations in the Hands & Feet* Third Party Certified Gluten, Dairy & Soy Free 60 Capsules :