Some types of yogurt are supplemented with probiotic bacterial strains such as Bifidobacterium animalis, a natural resident of many animals' gastrointestinal tracts – including ours – that previous research has linked with improved gastrointestinal health and immune function in humans.

一些类型的酸奶补充了益生菌菌株，如动物双歧杆菌，它是许多动物胃肠道(包括我们的胃肠道)的天然居民，先前的研究已经将其与改善人类的胃肠道健康和免疫功能联系起来。