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Quest Synergistic Selenium is a selenium diet supplement in combination with C & E vitamins that increase its absorption. Selenium is a fat-soluble antioxidant that significantly boosts the immune system and protects cells and organs from oxidative stress. Selenium is a predominant component of the antioxidant enzyme, glutathione peroxidase. It also contributes to normal spermatogenesis, to maintaining the physiological state of the nails and to the normal thyroid function