Professor Rose Anne Kenny:

I will begin by explicitly explaining that the 10,000 international units, IUs supplement that the Senator's sister is taking would be prescribed generally as a once-weekly or possibly twice-weekly dosage. It would not be prescribed for daily dosage. I am sorry that we are moving from micrograms to international units because it can be confusing but when we talk in big figures, in thousands and tens of thousands, we are talking about international units. I would echo Dr. McCartney's point that we need explicit guidelines for that very reason. Rare as vitamin D toxicity is, we do need NPHET to make an explicit recommendation and to provide guidelines.