Study protocol suggests consumption of probiotics in kefir positively alters the composition of the gut microbiome and may be linked to behavioral effects and improvements in sleep MORTON GROVE, Ill., May 8, 2024 /PRNewswire/ -- Lifeway Foods, Inc. (Nasdaq: LWAY), a leading U.S. supplier of kefir and fermented probiotic products that support the microbiome, applauds the recent study protocol titled, "Randomised controlled trial of the effects of kefir on behaviour, sleep and the microbiome in children with ...