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Question: I read on your website that some B-12 vitamins can cause diarrhea due to added sugar substitutes like sorbitol. I have had diarrhea and never thought it could be caused by my vitamin B-12 supplement, until I read your article and stopped taking the supplement. My diarrhea stopped immediately. Can you help me find a brand of B-12 that doesn't contain sorbitol or sugar substitutes that could cause this problem?
Answer: It's true that in order to taste good, some B-12 supplements (such as dissolvable tablets, liquids, and sprays) contain sugar substitutes which can cause gas, bloating, and diarrhea, as discussed in the B-12 section of the B Vitamins Review.