Glutathione is the most important antioxidant and detoxifying molecule in our body. We can synthesize it ourselves but we need key nutrients to do so. One of the most important is the amino acid cysteine.

Cysteine is required in a "rate limiting" step in the production of Glutathione. This means without cysteine the whole Glutathione production process can not move forward.

The supplement NAC (N-Acetyl Cysteine) is great at providing concentrated cysteine to the body. Usual supplemental doses range from 600-1200mg of NAC per day.

Certain foods are high in this vital amino acid. Most animal products are high in cysteine (Eggs, dairy, meat, fish). The following list shows the food sources highest in cysteine per 200 calories. I've included how many grams of each food constitutes 200 calories so you have some idea of how much you need to eat in order to get the listed cysteine mg amount.
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Ref: MyFoodData.com