Also known as: kefir, milk kefir, water kefir
Latest evidence update: 2026-06-06
Strongest in Consistency (91). Held back by Sample size (42).
Solid mix of RCTs with some methodological gaps.
Some independent replication, statistical precision uneven.
Hundreds of participants; meaningful but not large.
Studies agree on direction of effect.
Most studies are recent (last 2-3 years).
No quantified outcomes yet. Once we have studies with measurable endpoints, you will see per-outcome magnitude here.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
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Kefir consumption had no significant impact on diastolic blood pressure compared to control in adults over 18 years old.
Kefir consumption had no significant impact on systolic blood pressure compared to control in adults over 18 years old.
C-reactive protein levels significantly decreased with longer durations of kefir consumption of 8 weeks or more.
Kefir consumption had no significant impact on C-reactive protein levels compared to control in adults over 18 years old.
Kefir consumption showed no significant effect on anthropometric measures including weight and BMI.