I should clarify that the high level is required to take me from a deficient level up to the target level. Once I get there, I probably wouldn't need anywhere near that much. It'll probably be summer again by the time I catch up.Wow!
Maybe I should get retested - it's been a few years... (I only take 1000 IU daily, myself. But I've actually re-energized a bit this winter: Possibly just out of desperation to get stuff done!)