What is glutathione made from?

I ever read in website about Glutathione. Glutathione is found in almost all fruits and vegetables. Acorn squash, asparagus, avocado, cantaloupe, grapefruit, okra, orange, peach, potato, spinach, strawberries, tomato, watermelon, and zucchini are all good sources of GSH. Some vegetables, such as broccoli, cabbage, Brussels sprouts, cauliflower, kale, and parsley, not only provide GSH, but also actually stimulate the body produce more of this powerful antioxidant. Cooking destroys a lot of the glutathione in fresh fruits and vegetables, so you can get the most GSH from these foods by eating them raw or steamed. Eating foods high in glutamine, such as lean meats, eggs, wheat germ, and whole grains, can also stimulate the liver to produce more GSH.

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