I take oil based softgel D3 and K2 and these do not cause constipation. I take more magnesium than calcium as I've done a LOT of research on this issue and calcium can cause more negative issues than positive...I believe calcium is pushed too much and mag not enough. We need to be optimal with mag for our bone health...deficiency of mag is huge. I'm no doc, but working with healing for 25 yrs alternatively.