This is something that you really need to check with your doctor before using. To be able to find a 10,000 IU capsule available to take once weekly is insane for an over the counter product. I have been attempting to take these for 4 weeks now. I get horrible diarrhea (tmi) a day or two after the dose, I have been having dizzy and lightheaded spells every single time I stand up from a non sitting position. My kidneys ache and there are a host of other things that too much Vitamin D can cause. I went to the doctor and we went over everything and after a blood test my Vitamin D levels are THROUGH THE ROOF! If you need this product at that amount, please still discuss these with your doctor before taking them.