Antioxidant Formula With Added Zinc Caffeine Free Medication Free Acetyl L-carnitine is an active compound, the acetic acid ester of L-carnitine. L-carnitine is a compound that contains amino acids, also produced naturally in the human body. As carnitine is a component of the fatty acid transport system, the energy stored in fats can be used through it, and is therefore necessary to convert fat into energy. Zinc contributes to normal acid metabolism fatty acids and the maintenance of normal levels of testosterone in the blood. Zinc contributes to the normal metabolism of macronutrients and therefore has a crucial physiological role.