Kefir is a type of fermented milk that may help manage blood sugar, lower cholesterol, and boost digestive health, among other benefits. However, more evidence is needed to back some of these claims.

Kefir, pronounced kee-feer, is a drink made from the fermented milk from a cow, goat, or sheep. Water kefir is similar but has a water base instead of milk. Kefir grains have yeast and good bacteria.