MECHANISM OF ACTION
Carnitine is a quaternary ammonium compound biosynthesized primarily in the liver and kidneys from the amino acids lysine and methionine
Carnitine plays an essential role in the energy metabolism. it is required for the transport of fatty acids from the intermembraneous space in the mitochondria, into the mitochondrial matrix during the breakdown of lipids (fats) for the generation of metabolic energy
- carnitine is often promoted as a weight loss supplement (fat burner)
- Some studies suggest that L-carnitine can can boost athletic performance
- Male infertility: To improve sperm count and mobility
- Heart failure: carnitine deficiency is associated with congestive heart failure. L-carnitine increases exercise capacity and reduces ventricular size in patients with congestive heart failure 
Typical adult dosages range from 500-1000 mg two to three times a day.