Acetyl-L-carnitine is also known as ALC. Some people with high blood sugar use it to help with cholesterol as well as nerve pain, such as tingling in their hands and feet. Others have used it to help stop cell damage. It may also help improve appetite and help the body turn fat into energy. Some people use it to improve their mood. People with blood vessel problems in their legs have used it to help them walk better and to walk with less pain. ALC may also help people with low carnitine levels to have a more normal level in their blood.