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You wont absorb all of it, but such a high B12 injection dose ensures you have enough B12 circulating in your bloodstream at all times
That is why many practices choose to work with experienced billing partners
It can help treat patients with inherited vitamin B12 deficiency that results in poor absorption of vitamin B12
Additionally, while convenient, nasal sprays typically cant deliver as high a concentration of NAD+ as injections, which might be a consideration for those seeking more intensive therapy
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