Yep, I've heard the 10,000 seems to be the one that people take. My levels of vitamin D were appaulling, hence why the doc decided to take a drastic approach, which just backfired, but I think she's been using the same on other patients.

I don't get much sunlight myself, but I'm trying to push myself to go and sit outside for sometime each day. I know I need it! Eating beef liver, eggs, butter, natural cod liver oil etc can also help increase vitamin D too.