Compositions comprising L-carnitine or a salt thereof, acetyl L-carnitine or a salt thereof, vitamin B9 (folic Acid), vitamin A, vitamin B12, vitamin B5 (pantothenic acid), vitamin B6 (pyridoxine), arginine, vitamin C, vitamin E (α-Tocopherol), selenium, zinc, copper, iron, vitamin D and N-acetyl cysteine, and optionally one or more pharmaceutically acceptable excipients are provided. Dietary supplements comprising these compositions are also provided.