How Low B12 Affects the Brain and Body — and What to Do About It

Vitamin B12 is also crucial for brain and nerve health, so low levels can subtly affect how you think and feel. You might notice memory lapses, trouble concentrating, or mood shifts such as irritability or lower motivation. Over time, more noticeable symptoms can appear — shortness of breath, dizziness, or even changes in balance and coordination. Some people report a sore or smooth tongue, another sign of deficiency.

Because these symptoms overlap with other conditions, it’s easy to overlook B12 as the cause. That’s why checking in with a healthcare professional is key. With a simple test, they can confirm your levels and suggest dietary adjustments or supplements if needed. Catching a deficiency early can restore your energy, protect your nerves, and support clearer thinking — helping you feel like yourself again.