Element 08 of 37
Cobalamin
Vitamin B12
Nerves & Energy
What it does
B12 keeps your nerves insulated and firing properly and is needed to build healthy red blood cells that carry oxygen, which is why low levels often show up as fatigue and brain fog. It's found almost entirely in animal foods, so plant-based eaters and many people over 50 (who absorb it less well) commonly run low. We use the active methylcobalamin form.
The science
Essential for maintaining the myelin sheath that protects nerve cells, driving red blood cell production, and preventing systemic fatigue and cognitive decline.
Most relevant for
Vegans and vegetarians, adults over 50, and unexplained fatigue.
Taking metformin? Read our guide to metformin and vitamin B12.
Key references
- 1.NIH ODS: Vitamin B12 (Consumer)
- 2.Healthline: Vitamin B12 supplements
- 3.Examine.com: Vitamin B12
- 4.B12 supplementation on cognition, depressive symptoms & fatigue: systematic review, meta-analysis & meta-regression (PMC, 2021)
- 5.B12 efficacy on cognitive memory function & depressive symptoms: systematic review & meta-analysis (PMC, 2024)
Personalise your stack
General wellness information, not medical advice. Consult your healthcare provider before starting any supplement.