Longevity & Aging

Vitamin B12 Deficiency Mimics Aging and May Impair Mitochondrial Function

Vitamin B12 deficiency is surprisingly common and easy to miss because its symptoms — exhaustion, brain fog, tingling, poor balance — closely resemble normal aging. Traditionally, doctors linked these effects to anemia caused by faulty red blood cell production. But emerging 2026 research suggests B12 also plays a critical role in keeping mitochondria, the cell's energy engines, functioning properly. This means deficiency can impair energy production at the cellular level even before standard blood tests flag a problem. Older adults, vegans, vegetarians, and people on certain medications for diabetes or acid reflux face the highest risk. Since the body absorbs B12 less efficiently with age, routine testing and supplementation may be essential for anyone focused on long-term energy and cognitive health.