Recently, misleading information about Vitamin D supplementation has beeen circulating – not only in scientific papers but also in the press.

It has been mentioned that Vitamin D supplementation does not help to prevent osteoporosis or heart attack.

However, the studies cited were of very very low quality.

For instance, many failed to
– assess if there was Vitamine D deficiency in the first place before supplementation
– assess if Vit D levels actually rose to sufficient levels
– some never even bothered to measure.

Verdict: A lot of wasted time.

On the contrary, for depression, there is very clear data favoring Vitamin D supplementation IF there is a lack. The antidepressant effect is significant!

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4011048/