The book has written By Dr.R.Bhakyaraj, Head, Dept. of Bioscience (Microbiology and Biotechnology) with his Post Graduate Research Scholar Mr.T.V. Brahmma Rishi. The work has mainly focused to familiarize the conventional source as a probiotic. The probiotic cultures were isolated and confirmed by 16s rRNA sequencing method. This will help the researchers to get innovative idea to continue their research on probiotics.