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Some use injections for faster repletion and later switch to an oral routine
Certain medications can interfere with B12 levels too
NAD+, NMN and nicotinamide riboside supply the salvage pathway with material, adding substrate at or near the top of the route to the dinucleotide
Vitamin and Mineral Requirements in Human Nutrition (2nd ed.)
Allergic reactions to proprietary preparations of vitamin B12 might be due to substances added to the solutions as preservatives or for other reasons, to impurities from the production, or to the vitamin B12 itself
You should store it at room temperature between 59F and 85F
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