“In my experience, 2000 IU is an appropriate dose that most consistently brings most people into the favorable range for 25-hydroxy vitamin D on their blood test.” — Joel Fuhrman Copy Share Image
“therefore advise people to take 4,000 to 8,000 international units (IUs) per day of oil-based vitamin D3, or cholecalciferol, in gelcaps or drops, for assured absorption. This dose is sufficient to achieve a 25-hydroxy vitamin D blood level of 60… — William Davis Copy Share Image
