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When gastrointestinal symptoms occur, they often relate to supplement formulation, excipients, or underlying health conditions rather than the vitamin itself

These are: Older people Vitamin B12 deficiency is more common in older people, affecting around 1 in 20 aged from 65-74 and 1 in 10 over the age of 75

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and is useful in some cases of allergies by virtue of its ability to reduce histamine release.123 One of the sulfur-containing amino acids (along with cysteine and cystine), methionine is important (essential) to many bodily functions and must be directly consumed through supplementation or methionine-containing proteins