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The Key Factors in the Methylation Cycle We will now consider three important causes of interruption to the methylation cycle: Vitamin B12 deficiency Folate deficiency MTHFR mutation Vitamin B12 deficiency If vitamin B12 is deficient, the methyl group cannot be transferred from methylfolate to the methionine cycle
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When administered by a licensed professional in a sterile environment, B12 injections are considered very safe
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