Massive study finds vitamin d and fish oil fail to prevent depression
NCT ID NCT01696435
First seen Dec 15, 2025 · Last updated May 07, 2026 · Updated 22 times
Summary
This study looked at whether taking daily vitamin D or fish oil supplements could prevent depression in over 18,000 healthy adults. Participants had no major depression history and took supplements or placebos for about 5 years. The results showed that neither vitamin D nor fish oil reduced the risk of developing depression or improved mood scores compared to placebo.
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This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Locations
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Brigham and Women's Hospital
Boston, Massachusetts, 02215, United States
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