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A lack of cysteine and methionine can cause a lack of glutathione, allowing hydrogen peroxide molecules to accumulate
In relation to histamine, methylation is required for the HNMT enzyme (which breaks down histamine in the brain) and COMT enzyme (which detoxifies oestrogen in the liver)
Cai W, Liu L, Shi X, Liu Y, Wang J, Fang X, Chen Z, Ai D, Zhu Y, Zhang X
European Journal of Clinical Nutrition , 72(1), 105-111
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