Persistent fatigue, tingling in the hands and feet, memory lapses, or unexplained mood changes — these are among 12 warning signs that may be linked to a Vitamin B12 deficiency. An essential nutrient the body cannot produce on its own, B12 supports red blood cell production, nerve function, DNA synthesis, and energy metabolism. Because its symptoms often resemble those of other conditions, deficiency frequently goes unrecognised without a blood test.
In brief
- —12 physical and neurological signs may indicate B12 deficiency
- —Vegans, older adults and people with digestive disorders are most at risk
- —Blood tests are needed to confirm deficiency before any treatment
From fatigue to balance problems: the earliest physical signals
Ongoing fatigue is one of the first and most common signs of low B12 levels. Without enough of the vitamin, the body struggles to produce healthy red blood cells capable of carrying oxygen to tissues — leaving many people feeling exhausted even after a full night of sleep, with reduced endurance and difficulty concentrating.
Tingling, numbness, or burning sensations in the hands, feet, legs, or arms can follow as nerve function becomes impaired. B12 plays a direct role in maintaining the myelin sheath that protects nerve fibres, and when levels drop, these so-called pins-and-needles symptoms may emerge.
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