Too lazy to look it up in my notes now, but as far as I understand: 1) Vitamin D is low in people with all kinds of bad conditions, including depression but als

Too lazy to look it up in my notes now, but as far as I understand: 1) Vitamin D is low in people with all kinds of bad conditions, including depression but also heart issues/etc. 2) Supplementing vitamin D is usually not found to do anything to improve these conditions, or the effects are ambiguous, limited and minor. Clearly there's a 3rd variable. For lack of better options I call it "sun magic".