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b12 injection gave me fever what to do Signs You May Have a Deficiency High Vitamin B12 Levels: Causes,
Description
The patients age is the rate-limiting step

It is safe for you to take multivitamins containing vitamin B12 even if you are regularly having injections

The most common side effects are pain and swelling at the injection site

These adaptations may explain why metabolic benefits can continue to improve over weeks to months of consistent use, rather than plateauing immediately