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Actually, I use a coffee grinder.  Between the eggs I eat and what the lizards eat, I have 10 or more egg shells to grind.  I let them dry but I don't rinse them or remove the membrane which is a source of biotin.  I bought the electric coffee grinder for $5 at a thrift store but they are available a lot of places for under $20 brand new. 

Egg shell calcium is calcium carbonate which is primarily what your bones consist of.  It is readily digestable and the actual calcium uptake is great.  There are other forms of calcium, one of which is very slightly more usable but is used only in cases of sever calcium depletion. 

A huge advantage of egg shell calcium is that it is free, if you eat eggs. :)


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