Answer:

Fermented dairy products such as kefir and yogurt may contain substances which some evidence suggests may trigger migraine headache. In fact, a leading organization suggests that migraine sufferers limit their consumption of fermented foods. However, the risk seems lower with kefir than with other fermented dairy products, such as cheeses, as discussed in the Cautions and Concerns section of ConsumerLab's Review of Probiotic Supplements and Kefirs.

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