Memorize this: With a DS, it's not what you swallow it's what you ABSORB. We malabsorb fats, ergo fat soluble vitamins like ADEK. (Each one of us malabsorbs a bit differently.) My LAB results with falling A levels told me my vitamin A was not being absorbed and was being pooped out so I needed more vitamin A -- a lot more. An ordinary person would reach toxic levels by what I (and most with DS) take, but once you have the DS, you aren't "normal." FYI: You want most vit/nutrient lab results to be in the top of the range except for PTH which you want low.