Mitochondrial control of fuel switching via carnitine biosynthesis Science Your mitochondria are the tiny power plants inside your cells. They help create ATP the energy your body uses to power your brain, muscles, organs, recovery, and daily function. When mitochondrial Carnitine, Acylcarnitines and Beta Oxidation Comprehensive review of the expanding roles of the carnitine pool in metabolic physiology: beyond fatty acid oxidation Journal of Translational Medicine Springer Nature Link L carnitine levels decrease with age, contributing to aging and a decline in mitochondrial function. The list doesn't stop there. L carnitine supports: Joint health L carnitine has been shown to support joint comfort Metabolism: The carnitine shuttle and fatty acid metabolism (practice) Khan Academy