washing the shells, removing obvious residue, using heat to reduce microbial contamination, drying them completely, and then grinding them into an exceptionally fine powder.
The final texture should resemble a very fine powder rather than crushed shell fragments.
A clean spice grinder or similar appliance may be used to achieve a finer consistency.
However, homemade preparation does not provide the same quality control, purity testing, or standardized calcium content available with regulated food or supplement products.
How Much Calcium Does Eggshell Powder Contain?
This is where caution becomes particularly important.
