Glutathione is a master molecule produced by every cell in the body that performs nine vital functions: remove toxins, including heavy metals; decrease oxidative stress; increase cellular energy production; increase mental performance and clarity; increase rest and restorative sleep; optimize athletic ability and recovery; protection from the harmful effects of stress; rejuvenate your skin and youthful appearance; and slow down the aging process. It's comprised of amino acids cysteine, glutamate and glycine and acts as an important antioxidant to combat damaging free radical molecules.

Our body's supply of glutathione decreases as we get older, and these lower levels are accompanied by poorer health associated with old age. Other factors that can lower glutathione levels include cancer, HIV/AIDS, Type 2 diabetes, hepatitis and Parkinson's disease.

Certain supplements may increase glutathione production, such as: curcumin, N-acetylcysteine, selenium, silymarin, vitamin C and vitamin E. Some foods that are  high in amino acids that contain sulfur such as unprocessed meat, garlic, broccoli, asparagus, avocados and spinach may help.

Supplements are not regulated by the U.S. Food and Drug Administration in the same way as prescription drugs. They are treated as foods and do not have to prove that they are safe or effective before being sold.