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how do you inject a b12 shot to Give Injection: Step-By-Step Instructions Is It Okay To Use
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How Quickly Do B12 Injections Work

Although our previous preclinical studies suggest that a causal link exists between circulating IGF-1 deficiency and impairment of NVC responses, ascertaining the cause-and-effect relationship between age-related IGF-1 deficiency and impaired functional hyperemia in humans requires additional evidence

But these arent all of the medical reasons and there are also medications that interfere with B12 absorption

To avoid any serious interactions, they may recommend specific dosage amounts or suggest taking medications and B12 supplements at different times
