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Supports the function of the central nervous system

Vitamin B12 deficiency can be caused by not getting enough of it, problems with absorbing it, or taking a medication that interferes with its absorption.

If a deficiency does not exist, supplementing Vitamin B12 will likely not have the same positive effect. B12 injections are available, for $15 to $50 a pop, at spas and wellness centers, but its smart to talk to your physician before you spend money on them

Additional side effects that may occur with injectable B12 include a headache and feelings of pins and needles, says Drugs.com

Physical changes can also appear: a surprisingly pale complexion , a swollen and sore tongue (called glossitis ), or persistent mouth ulcers

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