Vitamin B12 is an essential nutrient that plays a key role in keeping your nerves, brain, and blood cells healthy. It helps your body produce DNA and supports energy production. However, many people don’t realize they are low in this vitamin until symptoms become more serious. Vitamin B12 deficiency can develop slowly, and the warning signs are often subtle at first.
vitamin B12 deficiency. This happens because your body needs B12 to produce healthy red blood cells that carry oxygen throughout the body. Without enough oxygen circulating, you may feel weak, drained, or unusually exhausted even after a full night’s sleep.
