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Apple Cider Vinegar and Stomach Acid: What the Research Shows Apple cider vinegar (ACV) contains acetic acid, typically at 48% concentration, which lowers stomach pH and can irritate sensitive gastrointestinal tissue

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In a study published in 2000 in the International Journal of Surgical Investigation , the researchers found that rats whose cells were perfused with calcium preserved more of their cellular glutathione and hence "demonstrated significantly lower oxidative stress and an improved liver function."28 The findings suggest that Life Extension Glutathione not only adds glutathione to your body but also may help you maintain the glutathione you already have