Low vitamin D doesn’t just weaken bones — it may also affect how you feel. A large review of 66 studies from 31 countries found that adults with low vitamin D were more likely to have depression, especially when blood levels dropped below 30 nmol/L. The research doesn’t prove that low vitamin D causes depression, but it shows a strong connection that experts say shouldn’t be ignored.
Vitamin D helps the brain work properly. It’s found in areas that control mood and helps lower inflammation, protect brain cells, and keep calcium levels balanced. Most studies found that people with low vitamin D had more symptoms of depression. But studies that followed people over time had mixed results, so it’s not clear whether low vitamin D leads to depression or the other way around.
Experts say it’s smart to check vitamin D levels in people with depression since deficiency is so common. Not getting enough sunlight, having higher body fat, or dealing with chronic illness can all lower vitamin D. While supplements haven’t been proven to treat depression, keeping vitamin D at healthy levels supports both physical and mental health — and could be one small step toward feeling better.
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