Yes, sorry I didn't have the bottle on hand to mention the dose. I'm going for 5000IU (the dose that the Shannon person in the article was taking for supplementation).

All the bottles at my pharmacy were 1000IU so I just bought one of them and take 5 of them.

I was surprised to read in the article (and elsewhere) that 5000IU doses was mentioned as a common OTC dose as I couldn't find it. But I live in Canada so maybe it's different.