Vitamin B12, also called cobalamin, is a vital nutrient your body needs for red blood cells, nerves, DNA, and energy. It is unique because it contains cobalt (hence “cobalamin”) and is the largest, most complex vitamin. Without enough B12, cells cannot function properly, leading to fatigue, brain fog, nerve issues, anemia, and long-term health problems.

Vitamin B12 (cobalamin) is essential for red blood cell production, nerve health, DNA synthesis, and energy. Its discovery unfolded over more than 100 years, turning a once-fatal disease, pernicious anemia, into a treatable condition.