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It is a co-factor for methionine synthase, an enzyme involved in the methylation cycle, which is crucial for the metabolism of amino acids and the production of neurotransmitters

Keep detailed inventory records that include purchase dates, lot numbers, and expiration dates

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When to seek medical help See a doctor promptly if you have spreading redness or warmth around the site, discharge or a fever, numbness or weakness that does not settle, or any swelling of the face, lips or throat or difficulty breathing, which can signal a rare allergic reaction and is a medical emergency