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Sulfhydryl group of cysteine can be considered also as a very strong reducing factor, which is very important for activity of many proteins, a oligopeptides (glutathione), has a strong influence on redox potential of environment in certain compartments in vivo, and can form a center of the active site of some enzymes (e.g

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In one review, vitamin D used as a male fertility supplement was associated with a consistent effect on sperm quality, improving motility as well as capacitation (the final changes a sperm undergoes before fertilizing the egg)

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