Kefir is a fermented, yogurt-like beverage made from different types of milk, such as cow, sheep, and goat. Like yogurt, kefir is rich in different beneficial probiotics that help keep your GI tract microbiota balanced. Kefir's main beneficial bacteria is Lactobacillus kefiri, while traditional yogurt's main probiotics are Lactobacillus bulgaricus and Streptococcus thermophilus.
A review article published in the journal Nutrients reported that kefir provides antioxidant, antimicrobial, anti-inflammatory, wound healing, and many other health benefits.