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Athletes and active individuals : Physical strain can increase your need for B12

Some symptoms of vitamin B12 deficiency include: Weakness and tiredness Pale or yellowish skin Loss of appetite Heart palpitations Mouth or tongue soreness Tingling or "pins and needles" sensation in your hands and feet Shortness of breath Dizziness Blurry vision Mood swings or personality changes You are more at-risk for developing vitamin B12 deficiency if you are: Pregnant Over 65 Vegan Take medicine for diabetes Take medicine for heartburn Have had surgery to remove part of your bowels Health News Frequent Marijuana Use Linked to Higher Stress Hormone Levels Nearly 1.6 Million Dozen Eggs Pulled From Shelves Over Salmonella Concerns Back Pain

Cardiovascular (Heart and Blood Vessel) Complications In rare but serious cases, B12 replacement can lead to heart and blood vessel problems: Shortness of breath Peripheral edema (swelling in legs and arms) Rapid weight gain Pulmonary edema (fluid in lungs) Congestive heart failure (heart cannot pump effectively) Blood clots in vessels These complications arise from increased blood volume, thicker blood, and sudden changes in how hard the heart needs to work

Longer-lasting, sometimes preferred for patients with active detoxification goals

B12 is water-soluble and considered very safe, since excess is cleared by the kidneys