Dr. Steven Langer's Glutathione Precursor Complex contains three essential amino acids that make up glutathione itself (a tri-peptide combination of glutamate, cysteine, and glycine), along with supporting nutrients for optimal absorption by the body. For people over 45, and certainly those over 60, boosting glutathione levels can be essential for overall health. In fact, no one is immune to the decline of this important ingredient that occurs naturally as we age. To provide a foundation for good physical fitness and energy, Dr. Steven Langer's Glutathione Precursor Complex includes the following key ingredients: Setria Glutathione, a reduced form of glutathione for optimal bioavailability pure amino acids, AjiPure pharmaceutical grade L-glutamine and L-cysteine TMG for glutathione synthesis Vitamin C to boost glutathione in red blood cells Alpha Lipoic Acid, which replenishes the antioxidant potential of glutathione standardized milk thistle, one of the most powerful herbs for liver health, and Acetyl L-Carnitine, which supports the proper distribution of glutathione and enhances its activity