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In fact, your body might only absorb a tiny fraction of the B12 from a pill
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In contrast, 10 studies investigated the relationship between B12 supplementation status and homocysteine levels, encompassing a total of 191 participants (mean: 19.1 per study)
Its activity intersects two major metabolic pathways simultaneously: the NAD+ biosynthesis pathway (by consuming nicotinamide, an NAD+ precursor, NNMT competes with the NAD+ salvage pathway) and the methyl-donor pathway (by consuming SAM, NNMT reduces the availability of methyl groups for epigenetic and metabolic methylation reactions)
If you already have a diagnosed deficiency under NHS care and your symptoms return before your next scheduled dose, that is a conversation to have with your GP, who can review the schedule
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