I used 4 to 6 drops of Thorne or Seeking Health topically thru the winter - so 4,000 to 6,000 units daily. My 25oh D lab value was only 30. I drink at least 48 ounces of ray milk daily. Calcium test was normal. I also used k2 topically daily. I rarely use any other supplements. I drink organic coffee in morning, 3 oranges daily, oysters weekly, liver about once a month, grass-fed beef a few times a week, 3 Prunes in morning for boron.