The document discusses probiotics, which are live microorganisms that provide health benefits when consumed. It defines probiotics and lists common types including various Lactobacillus and Bifidobacterium bacteria. The document then outlines uses of probiotics for humans, cattle/poultry, and aquaculture. It provides a table of commercial probiotic strains and discusses specific probiotic supplements including Bio-K+, Bio-K+ Fruity, Bio-K+ Dairy Free, and Bio-Kaps Regular Strength.