can you feel b12 injection right away Why Do I Worse After My Injection? Causes & Management – Bolt Pharmacy Feeling worse after B12 Injection:

Many people who have hypothyroidism (an underactive thyroid) are also low in vitamin B12

White blood cells are essential for fighting infections, so low B12 can leave you vulnerable to illness

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Individuals looking to increase their B12 levels to boost energy or immune function may be wondering, How quickly does a B12 shot work? Ultimately, this can depend on a number of factors, such as your current B12 intake and how effectively your body can process B12

Low blood levels of the vitamin have been linked to several health problems