What dosage were you taking?
I had these 17K caps which were supposed to be taken once every 3 weeks or whatever. I took one a day for a few weeks, then every other day for a few and then a couple of times a week. Kind of a haphazard way of doing it; ideally you'd do blood work to see where you're at and sites on the net say you should do bloods if taking more than 4K a week, while some say 10K should generally be safe. But I started that bottle a year ago maybe and haven't taken any for months but as my calcium levels were sky high I mentioned taking vitamin D a while back. Doc said you don't "need more than 3K a day if it's the active form" and I said it was cholecalciferol but he didn't know that was D3, active. And in any case I think he just pulled the 3K figure out of his ass as that too is more than "recommended" plus they don't even go by IUs here but mcgs.