These are the precursors to GLUTATHIONE (The Mother of All Antioxidants), ensuring good amounts of these three amino acids will help support glutathione levels. 

Where to find these?

Regularly supplying your diet with sunflower seeds, legumes, eggs, kale, fish, spinach, broccoli, and mushrooms will provide all three of these awesome amino acids.
StructuralChiro: http://goo.gl/lNju1s