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Those given the lower dose had improved depression scores (Ashktorab 2022
Because injections skip this step, the absorption rate of B12 is significantly higher and more predictable than oral supplements
Malabsorption from coeliac disease, Crohns, gastric surgery or long-term metformin and proton-pump inhibitors accounts for much of the rest
But you need to be aware that anytime you take an oral supplement or medication or receive an injection, there are potential side effects, which may be more common with oral dosage
In people with normal B12 levels, though, injections have not been shown to boost athletic performance
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