Some people might experience skin changes, including acne, due to alterations in their bodys metabolism and detoxification processes following the injections
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*Pull back on the plunger a little to make sure you did not hit a blood vessel
Common ones include mild reactions at the injection site
Who Should Take Vitamin B12
That being said, some people who have taken injectable vitamin B12 have complained of difficulty walking and balancing, nervousness, anxiety, weakness, lack of coordination, and even a sensation of pins and needles, per SFGate