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Because this is a water-soluble vitamin, its not going to linger in your body as long as a fat-soluble one might
Anything higher than that quickly becomes too much volume for one subQ site, which is why oral capsules are the standard route
Genetic variants in methionine synthase, methylenetetrahydrofolate reductase (MTHFR), and homocysteine metabolism pathways influence how efficiently your body processes B12, informing whether standard or optimized dosing may be more appropriate
The bad news is that they might last for the entire day, which can ruin productivity and make it feel like youve wasted your weekend
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