Everybody is unique. What works for some, might not for others. I did what you said and my results were different. It did lower overall cholesterol, HDL, but had no effect on LDL at all. So I switched to Vit D-3 @1000 iu, same results. Nothing I, or my Dr., has done has had a positive impact on my HDL being too low. It seems I'm stuck at 84x6 months now. I still take Vit D-3, since I have witnessed other improvements in my health that my Dr. attributes to it.
hdl should read 34, not 84. duh!
I believe if you take a very good absorbable calcium supplement along with your D, you can increase the amount of D and calcium (both) you can absorb.
In general most people are way, way low on vitamin D. I know doctors who take 10-20,000 IU of D a day. And then bump it up more in the winter.
Considering your body can make 50,000 IU with decent skin exposure for a half hour at peak sun, almost everyone is deficient.
If you want to lower LDL, I thought eating oatmeal was good for that.