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Vitamin D3 sources: Fatty fish (salmon, mackerel), eggs, fortified dairy, and most importantly, sensible sunlight exposure (10-15 minutes daily face and arms) to stimulate natural production
This is one of the main reasons people report completely opposite experiences
Neurological recovery from B12 deficiency typically takes months, though some patients report reduced symptoms within weeks of starting treatment
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Methylcobalamin acts as an essential cofactor in two primary enzyme reactions crucial for human metabolism: Homocysteine to Methionine Conversion: Methylcobalamin is required by the enzyme methionine synthase
J Clin Invest 118(6):22462259
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