Algaecal is like the pharmaceutical company - they don't care about you, they just want the profits. They have a slew of additives in their product. I went on that years ago prior to the added ingredients and lost bone density. Can't imagine what it would do to you now. A quality calcium is microcrystalline hydroxyapatite complex with D, magnesium, k1,k2 and boron. Also nothing with binders and fillers. Which most supplements tend to have these days. They all make money of everyone being sick. It is hard to stomach. Would be nice if Ellon Musk could find a cure -