How do vitamin B12 injections work, and who can actually benefit from them?

Doctors prescribe vitamin B12 shots for people with a B12 deficiency or those with an underlying condition that inteferes with proper B12 absorption.
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How to tell if you have a vitamin B12 deficiency and treat it effectively

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U.S. has a plan to start Pfizer vaccine shots in December -Health Secretary Azar

WASHINGTON, Nov 10 (Reuters) - If Pfizer Inc (PFE.N), opens new tab submits the positive initial data from its COVID-19 vaccine trial to health regulators as quickly as expected, the U.S. government ...
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Effects, Dosage and Potential Risks of Vitamin B12 Supplementation

Vitamin B12 plays a crucial role in the health and performance of the body. With this knowledge, people often reach for supplements at the drugstore. But how much Vitamin B12 do we actually need, and ...