It is a substance that normally occurs in 2 forms:

  • D-carnitine
  • L-carnitine

D-carnitine has no function in the human body and may even be toxic if ingested in large quantities.

L-carnitine is a substance that plays a role in the metabolic activity of the body. It is a popular nutritional supplement for weight loss, as it intensifies the conversion of fats into energy by binding fatty acids.