This was in otherwise generally healthy people, so the dosage is going to be less than you'd give to a person with a deficiency. A person with a moderate defic

This was in otherwise generally healthy people, so the dosage is going to be less than you'd give to a person with a deficiency. A person with a moderate deficiency would probably get 5,000 IU. Doses up to 10,000 IU are fairly well tolerated. So, no it's not a large dose. It's a modest dose.