A new study presented at Digestive and Disease Week (DDW) in Washington DC shows that of the 22 top-selling probiotic products on the market, 12 of them contain gluten. This raises concerns for people who have celiac disease, as they often take probiotics to improve their digestive health. While most of the tested products only contained trace amounts of gluten, it's not clear if trace amounts can worsen celiac disease symptoms. Four of the tested products contained more than trace amounts.
Nazareth S, Lebwohl B, Voyksner JS, et al. Widespread Contamination of Probiotics With Gluten, Detected by Liquid Chromatography-Mass Spectrometry. Gastroenterology. 2015 April;148(4):S-28
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