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J Adv Res 31:127136
B12 injections are more effective for severe deficiency or absorption issues because they bypass the digestive system
These areas (upper arms, outer-upper thighs, and belly area) have fewer blood vessels than muscle, which allows nutrients to absorb more slowly and consistently over time
(4) So, for anyone dealing with GI disorders that impair absorption, low stomach acid (age), or inadequate intake, or for vegans and vegetarians, getting enough vitamin B12 can be challenging
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