STORY AT-A-GLANCE There is a long list of symptoms of vitamin B12 deficiency as the vitamin affects several bodily systems. They include tingling or numbness, balance or gait problems, memory loss, difficulty thinking, depression and heart palpitations Groups of people with a higher risk of deficiency include older adults and people with pernicious anemia, stomach or intestinal surgery, vegetarians and vegans, and regular coffee and alcohol drinkers It is easy to miss a vitamin B12 deficiency as the symptoms may mimic other conditions. Even people with serum levels within normal limits may have symptoms since you may not have enough vitamin B12 for tissue availability Deficiency may be an underestimated factor in cognitive impairment and dementia; early evaluation of treatment protocols also suggest a combination of vitamins D, B12 and magnesium may lower your risk of poor COVID-19 outcomes A significant portion of Americans have some type of vitamin deficiency, one of which is v...