For reference I take 5,000 IU daily, recommended by my doctor. We worked up to that amount over time, testing my Vit D levels until they made into the "normal"

For reference I take 5,000 IU daily, recommended by my doctor. We worked up to that amount over time, testing my Vit D levels until they made into the "normal" range. I live in a very sunny state and am outside in the sun at least an hour a day during peak daylight hours, sometimes much more. Many other members of my immediate family also have amazingly low Vit D levels despite plenty of outside time.