Way too much too read . The Post asked what people take ? Skimmed through the pages and never did see it . Lol . Is this the right link ?

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Wondering what you mean by "citrate is the worst". It is much better absorbed than carbonate and gentler on the stomach as well. Calcium Hydroxyapatite seems to have a positive effect on bone (it is cow bone afterall) but with caveats. Studies indicate that it increases phosphate levels in the blood so if you are prone to kidney stones, it's something you might want to look into. I take some hydroxyapatite but minimize its usage and balance my intake with calcium citrate, supportive nutrient supplementation and highly nutritive foods (which is always your best bet).