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it dictates the required concentration, route of administration, and frequency

This includes vegans and vegetarians, older adults, individuals with atrophic gastritis, pernicious anemia, gastrointestinal disorders, those who have had gastrointestinal surgery and people who take certain medications including, but not limited to, estrogen (HRT), and birth control pills

"The lack of rigorous, long-term studies is a major concern," notes Dr

Vitamin B12 As you age, your body loses some of its ability to absorb vitamin B12, and your risk of B12 deficiency increases

Speak with your healthcare provider if you are concerned about your vitamin B12 levels and to find out if supplements are the right choice for you

The medication can increase heart rate and blood pressure