An essential vitamin vital for energy production, healthy blood cells, nerve function, and mental focus.
What it is
Vitamin B12 (cobalamin) is an essential water-soluble nutrient containing cobalt. Since your body cannot make B12 on its own, it must come from food or supplements. It serves as a necessary helper for making red blood cells, insulating nerve fibers, and releasing energy from food.
Also known as: Cobalamin, Methylcobalamin, Cyanocobalamin
Key benefits
- Helps build healthy red blood cells, which carry oxygen throughout your body.
- Protects the outer lining of nerve cells, supporting clear focus and nerve health.
- Supports cellular energy production, so you feel vibrant and alert.
- Helps regulate homocysteine levels (a substance linked to heart health when it runs high), supporting heart and brain wellness.
Amplified by probiotics
Vitamin B12 absorption happens in the lower part of your small intestine. Helpful gut bacteria keep your gut wall healthy and reduce unwanted microbes that might compete for B12. Some probiotic strains even produce extra natural cobalamin in your gut, supporting your overall B12 levels.
Typical dose
2.4–1,000 µg/day
The evidence
Evidence: strongHuman research shows that taking B12 by mouth supports red blood cell production, nerve function, and cellular energy release (Green et al. 2017, Nat Rev Dis Primers; O'Leary & Samman 2010, Nutrients).
Safety & who should check first
Excellent safety profile with no established upper limit because your body excretes any excess. Safe for daily long-term use.