Dietary Supplement Cognitive Health Brain Function Muscle Support Gluten-Free No Artificial-Preservatives Potency & Quality Guaranteed An FDA Regulated Facility Carlson - Providing the highest quality nutritional supplements since 1965 Acetyl L-Carnitine, or ALCAR, is a modified amino acid that promotes cognitive health and brain function, and supports healthy muscles. Acetyl L-Carnitine is important for protein formation and helps promote athletic performance.