Vitamin D dosage can be one of the following:

  1. Safe and effective
  2. Safe but ineffective
  3. Unsafe but effective
  4. Unsafe and ineffective

The purpose of this site is to help doctors and patients decide the right dose that is both safe and effective.

The knock on vitamins in general has been they are typically safe in common doses but also basically useless. The criticism of modest vitamin doses is they don’t do much, or much less than higher doses could. Or that people who have taken higher doses can get vitamin D toxicity. Too little vitamin D can cause health problems but so can too much. How do you decide the right amount? What is too small a dose? How much is too much?


You can’t properly decide on the right dosage until you decide your purpose. Vitamin D dosage can be either for: a) emergency intervention; b) deficiency recovery; or, c) regular maintenance. The dosage could be very different based on which goal.

For example, some patients get 500,000 IU to deal with an urgent situation; others take 50,000 IU for resolve a deficiency; or have only 5000 IU for maintenance.

The most popular recovery dosage is the Holick Protocol.