From the footnotes: > In the studies, daily low doses were 400 to 4000 IU per day, and higher-doses administered at longer intervals were 60,000 to 120,000 IU

From the footnotes: > In the studies, daily low doses were 400 to 4000 IU per day, and higher-doses administered at longer intervals were 60,000 to 120,000 IU once per month or less.