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Kefir is cultured milk, fermented with kefir grains. It is a sour, tangy yogurt-like drink that has so many health benefits. It promises so many benefits that it is almost difficult to believe. It can treat ulcer, diarrhea, acne, bronchitis, tuberculosis, leaky gut syndrome, arthritis, gout, rheumatism, depression, acne, eczema, heart problems, kidney troubles, ADHD, cholesterol problems, hepatitis, cancer and possibly HIV/AIDS, while boosting your immune system, cleansing your digestive tract and slowing down the aging process.