Lactobacillus casei is a type of beneficial bacteria that is commonly found in the human gut and is also present in some fermented foods, such as yogurt and cheese. It is a "friendly" bacteria that helps to maintain a healthy balance of bacteria in the gut.
In protein powders, Lactobacillus casei may be added as a probiotic supplement to support gut health and digestion. It is believed to help improve digestive function, boost the immune system, and support the body's natural defenses against harmful bacteria.
Lactobacillus casei is generally considered safe when consumed in recommended amounts.