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Numbness Do your hands, feet, or legs feel like they’re on “pins and needles”? Shortage of B12 can damage the protective sheath that covers your nerves. Diseases like celiac, Crohn’s, or other gut illnesses may make it harder for your body to absorb the vitamin. So can taking some heartburn drugs. You’re Colder Than Usual Without enough B12, you might not have enough healthy red blood cells to move oxygen around your body (anemia). That can leave you shivering and cold, especially in your hands and feet. Brain Fog A lack of B12 may lead to depression, confusion, memory problems, and dementia. It also can affect your balance. B12 supplements are usually safe. For adults, doctors recommend 2.4 micrograms a day. If you take more than what you need, your body passes the rest out through your pee. Still, high doses could have some side effects, like dizziness, headache, anxiety, nausea, and vomiting. Weakness Your muscles may lack strength. You also might feel tired or lightheaded. Your d...