whats all this talk about crushed oyster shell calcium and calcium carbonate, saying the oyster shells can't be broken down. I use the rep-cal phosphorous-free calcium with d3 mixed with rep-cal herptivite w/beta carotene multivitamins, which contains "100% natural phosphorus -free oyster shell calcium carbonate." So is that all wrong just because its crushed oyster shells? I really get head pains while reading though all this about how this powder is junk and the other is great, and D3 is not needed, get it without, blah blah
Is there any clear websites with compair charts or something?
