Sources of Calcium for my heard include cuttle bone, egg shells, both avian and reptilian, and the primary source, Ground Oyster Shell. It is also called oyster flour, and is widely used in the poultry industry and also by gardeners. It is very cheap, about $8.00 or so for a 50lb. bag, it looks like the bags concrete is sold in. I suspect this is what the Rep-Cal people buy and refine and repackage and mark-up... Folks occassionally caution me about the potential of heavy metals, but so far lack data to show it is an issue. The source I use "Pacific Pearl" is said to get shells from aqua-culture projects producing oysters for human consumption, so I would assume they are reasonably "clean" source. If you want it, order it from your local Feed & Grain store, that sells equestrian/poultry/ garden supplies. My herd eats a lot of it, and they shells look great, hard and smooth like wild ones. Good luck, Vic H.

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