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How long the effects last depends on your health and how low your B12 levels are
Methionine also aids in the synthesis of important molecules like proteins and other amino acids
A tolerable upper intake level (UL)the amount you can safely take without risk of severe side effectswas never set for it because it has a low potential for toxicity, and the body does not store it in excess (NIH-a, 2021)
The procedure takes only a few minutes, making it one of the fastest clinical options for targeted B12 supplementation
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