What comparison is drawn between limestone powder and eggshell powder regarding their chemical content?
Answer
Both limestone and eggshell powder are sources of calcium carbonate ($ ext{CaCO}_3$).
When discussing dietary calcium alternatives, a direct chemical comparison is made between limestone powder and eggshell powder. Both substances are fundamentally sources of calcium carbonate ($ ext{CaCO}_3$). This chemical similarity means they share the same basic mineral compound that provides the calcium nutrient. However, the text emphasizes that despite this shared chemical base, the final suitability for human ingestion is entirely dependent on secondary factors like processing, refinement, and the absence of contaminants, which differ significantly based on their raw material origins.
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