Vitamin B12, Active (Holo Transcobalamin)
- An active B12 test measures the amount of B12 that available for your body to use. Vitamin B12 is important for red blood cell formation and a healthy nervous system.
- Vitamin B12, together with folate and iron, plays a key role in forming red blood cells — which carry oxygen around your body. Vitamin B12 is also important for a healthy nervous system and plays a role in protecting against heart disease.