“Vitamin D cures depression”
Does vitamin D cure depression? What the evidence says
The short answer
No. Vitamin D does not cure depression, and a very large trial found it does not prevent it either. There is some evidence it may modestly ease symptoms in people who are already depressed, especially if they are low in vitamin D, but it is not a replacement for proper treatment.
Where the claim comes from
People with depression tend to have lower vitamin D levels than people without it, and low mood is more common in winter, when we make less vitamin D from sunlight. That link is real, but it is an association. It could also run the other way: people who feel low tend to go outside less, which lowers vitamin D.
The full evidence breakdown
Every key study, how strong it is, the caveats and what the headlines got wrong, in a report you can keep.
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The honest summary
Vitamin D does not prevent depression in the general population, and there is no evidence it cures it. It may help a little as an add-on for some people with depression, particularly if they are deficient. If you are low in vitamin D, correcting it is worthwhile for many reasons. If you are struggling with your mood, please speak to your GP rather than relying on a supplement.
Key source
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Check a claimNot medical advice. This article summarises published research for general education. It is not a diagnosis or a treatment recommendation. Always speak to a qualified healthcare professional about your own health.