Vitamin D, 5000IU daily, year-round. (My latitude is about 38.85 oN, but I think I'd be taking it even further South).
Perhaps once ever 2-3 days I'll also take B6/B12/Folate.
I don't take a multivitamin because I don't want excess Vitamin E.
ETA: Forgot to mention that I add crushed flaxseed to my yoghurt.
Since it turns out that it isn't feasible to include check as many as apply questions in the big survey, I'm asking about supplements here. I've got a bunch of questions, and I don't mind at all if you just answer some of them.
What supplements do you take? At what dosages? Are there other considerations, like with/without food or time of day?
Are there supplements you've stopped using?
How did you decide to take the supplements you're using? How do you decide whether to continue taking them?
Do you have preferred suppliers? How did you choose them?