But not during the winter months, at least not in the Midwest. I take 5000IU daily during the fall and winter but slack off during warmer weather as I try to spend a fair amount of time outdoors. I am on the fence about the health effects of taking extra Vitamin D, but the pills are cheap and easy to swallow.FWIW, you can also make yourself a pretty decent amount of Vitamin D just by getting a good dose of lunchtime sunshine. Not measurable, but not insignificant either.