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It is also an important thiol buffer, maintaining sulfhydryl groups in their reduced form, an additional mechanism for cellular signaling
PubMed , The FASEB Journal , vol
Dark green vegetables (e.g., spinach, broccoli, Brussels sprouts, and romaine lettuce), cereals (especially whole grains), fruits (e.g., oranges, papaya, and avocado), and legumes (e.g., chickpea, soybean, and lentil) are the major sources 1,13,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89