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Active tuberculosis
If taking oral supplements, it usually takes 2 to 4 weeks to feel a significant difference as levels build up in the body
It addresses functional B-vitamin insufficiency, particularly during periods of stress or increased metabolic demand, while avoiding imbalance that can occur when single B vitamins are given in isolation
[1] The NHS advises that taking up to 2mg (2000 micrograms) per day of vitamin B12 supplements is unlikely to cause harm
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