I'm not sure whether D3 can help with depression in general. However what triggered my question was the fact that you have SAD in winter when there is the least sunshine. I know that bright light is very important for SAD, but wonder whether it would also be worth you having a blood test in winter to see if your Vit D levels are OK. I don't have depression but my body doesn't absorb Vitamin D very well so I have to supplement. I don't sleep well when I'm lacking in Vit D. Apparently D3 is the best form to take.
Here are a couple of websites I found which may be of interest:
https://www.vitamindcouncil.org/heal...ns/depression/
http://www.drweil.com/drw/u/ART03384...order-SAD.html
All the best!
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Dx MDS RAEB 10% blasts + hypogammaglobulinemia, Sep 2011. Jan 2012 BMB - blasts down to 2% w/out treatment so BMT cancelled. Re-diagnosis RCMD. Watch and wait from Feb 2012. IVIg 5-weekly. New diagnosis Oct 2019 AML 23% blasts in marrow, 10% blasts in peripheral blood.
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