Kefir is considered a health-promoting fermented dairy drink, rich in probiotics, vitamins (B12, B2, K2), and minerals. Typical benefits include improved digestion, immune support, and potentially better lactose tolerance. However, when first consumed or in large amounts, temporary symptoms like bloating, gas, or mild gastrointestinal discomfort can occur due to gut flora adjustment. In histamine-sensitive individuals, kefir may trigger headaches or skin reactions. The evidence is largely practice-based; large randomized trials are often lacking. For healthy adults, moderate consumption (about 100–200 ml/day) is safe and can be part of a balanced diet. Those with existing conditions or concerns should consult a healthcare professional.
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