No improvement in depressive symptoms by vitamin D supplementation: results from a randomised controlled trial.

J Nutr Sci · 2018 · PMC6262688 · PMID 30510695

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highly significantno p-value reported

Although there was a highly significant relationship, the difference in serum 25(OH)D between those who were in the highest depression score quartile v. those in the lowest was only about 6 %.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.