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Blood work can help clarify vitamin levels or other possible causes of persistent fatigue

Muscle twitching may be an adverse effect of drugs like corticosteroids and estrogen

Injections can cause minor effects such as irritation or itching at the injection site, and the consumer fact sheet is a good plain-language reference on what B12 does and does not do

These nutrients were chosen because they have the most research supporting their benefits

Chances are, if you see a physician regularly or are into preventative health, youve heard of or even had a vitamin B12 injection or an injection with a mixture of B vitamins and other things like antioxidants

Vitamin B12 is a nutrient that your body doesn't make, so you have to get it from animal products, such as meats, dairy, and eggs, or from supplements