I am making my own probiotics by making fresh yogurt from scratch. I tried different commercial probiotics, and in my experience home-made yogurt is the best probiotic. It is a lot easier than you think. All you need is a yogurt maker (Amazon), good milk (supermarket) and a yogurt starter (iherb).

https://www.amazon.com/Yogourmet-10...words=yogourmet

https://www.iherb.com/pr/Yogourmet-...-5-g-Each/11770