Kefir typically contains more probiotic bacterial species and higher colony-forming units per serving than yogurt.

“Kefir typically contains more strains of probiotic bacteria than yogurt… This is because yogurt has a more shorter fermentation process. It’s typically fermented for only 2 to 4 hours… Kefir on the other hand is typically fermented for 18+ hours…”

“kefir usually contains more probiotic species of bacteria than yogurt and per serving it often has more Colony forming units of bacteria”