I see calcium carbonate (mineral)/ascorbate/citrate/pyruvate and coral calcium on their website? If they start to sell fine clean eggshell powder, I'll be interested.I think I might have mixed arsenic it with aluminum. Are you sure purebulk dont sell it anymore? I asked them about calcium carbonate a couple of months ago, and I think they are in the process of changing it to eggshell calcium due to less heavy metals. I might be wrong though, but that was at least the impression they gave me.
Would anyone know if the aluminium in the oystershell would be in an absorbable form?