May 1, 2025 • 7 mins
Story at-a-glance
- Research suggests "normal" vitamin B12 levels are insufficient for optimal brain health, especially in older adults, despite being above the standard medical threshold
- Vitamin B12 helps your nerves work well by protecting them with a special coating, allowing brain messages to travel quickly and clearly
- A study of healthy older adults showed that lower B12 levels, even within the "normal" range, were linked to slower thinking and brain signals
- Signs of low B12 include brain fog, memory issues, tingling in hands and feet, and mood swings; these symptoms often develop gradually
- Rich sources of B12 include grass fed meat, eggs and dairy; supplementation is often necessary for vegans, older adults or those taking certain medications like metformin
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