Medically reviewed by Lindsay Cook, PharmD The recommended intake of vitamin B12 for people older than 14 is 2.4 micrograms a ...

Vitamin B12 deficiency develops gradually and affects both the blood and nervous system. It causes anemia, fatigue, numbness, ...

Vitamin B12 is an essential nutrient that's often overlooked. Also known as cobalamin, vitamin B12 helps your body produce vital red blood cells and boost your energy levels, among other things.