Probiotics are live microorganisms that are intended to have health benefits when consumed or applied to the body. Probiotics are foods or supplements that contain live microorganisms intended to maintain or improve the "good" bacteria (normal microflora) in the gut.Lactobacillus and bifidobacterium species are the most commonly used probiotics.Dahi is a natural probiotic.Curd or dahi is a traditional yogurt or fermented milk product, originating from the Indian subcontinent, usually prepared from cow's milk, and sometimes buffalo milk, or even goat milk. It is popular throughout the Indian subcontinent including Nepal, Bangladesh, Srilanka and Pakistan.The word curd is used in Indian