Vitamin B12 is known as the energy vitamin and is extremely important for our bodies, especially for the function of the brain and the nervous system. B12 is huge for the formation of red blood cells. It helps metabolize every cell in the human body, especially affecting DNA synthesis and regulation, which is really important because our bodies are made up of DNA. It also helps to boost the mood, maintains a healthy digestive system, increases memory overall to avoid Alzheimer’s. Slow aging, build up the immune system, replenish skin, hair, and nails. So for women, very important. Protects against cancer including breast, colon, lung, and prostate cancer. As for deficiencies, low B12 levels can cause fatigue, weakness, memory loss, and other problems.