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Kefir can cause intestinal cramping and constipation, especially when use is started.
Special Precautions & Warnings:Children: Kefir is POSSIBLY SAFE for children between the ages of 1 and 5 years when taken by mouth for up to 10 days.
Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking kefir if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
AIDS and other conditions that weaken the immune system: Kefir contains actively growing bacteria and yeast. There is some concern that people with a weakened immune system might be more likely to develop infections from these bacteria or yeast.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.