Piece of anecdata for you. I take 2000iu of d3 daily, and live in Seattle. I've found when I stop taking d3 it's highly correlated to feelings of depression. On

Piece of anecdata for you. I take 2000iu of d3 daily, and live in Seattle. I've found when I stop taking d3 it's highly correlated to feelings of depression. Once I realize what's going on, if I start taking it again usually the depression starts to lift within days. Now that said, it's not clear to me that it's causitive, since usually when I stop taking my dose, it's because I've run out, and it's very possible my not having time or interest to get more means I may have already started down the depressed path, and I may already be recovering when I finally start taking care of myself. In any event I don't seem to get the really dark depressions I got before taking d3 and I don't dare stop taking it intentionally. Even if it's largely placebo the cost and risk seem very small conpared to my perceived benefits.