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The short answerit can vary by individual, but many people begin feeling noticeable effects within hours or days
[41] : 973974 Exclusive or near-exclusive breastfeeding beyond six months is a strong indicator of low serum vitamin status in nursing infants
However, if you are sensitive to methylated nutrients or already reacting to supplements, starting with single-ingredient B12 may be safer before introducing a full B-complex
Serotonin production is supported by vitamin B12, which can reduce the risk of overeating and regulate appetite
Information derived from existing preclinical literature
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