So, I probably don't get enough calcium when not eating canned salmon from TJs. Most days I get ~30% rda if lucky, so I would like to incorporate egg shells. They are 95-97% calcium, and seems like a waste throwing them away. They also seem more natural than supplements. I have seen a couple posts on here about dissolving them in lemon juice. Is this necessary, or can they be powdered and mixed with water to drink? I would think HCL wouldn't have a problem digesting them in the stomach.
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You can grind them in coffee grinder for fine powder. Or you might just eat your braised oxtail bones that you add to your stock pot. They go soft enough to eat. And tastes better than eggshell powder.
Eggshells are a perfectly acceptable source of calcium. I recommend placing them in boiling water for several minutes just to make sure anything that was riding on the outside of the eggs is dead.
I grind my own eggshells up in a coffee grinder and sprinkle on foods and dogfood, as well. I don't think you're crazy at all...It's also good to mix with eggwhite and use as a nourishing, firming facial...
After a workout I will sometimes make a whey protein shake, and I'll drop a whole egg, shell and all in the blender with they whey, and maybe some berries too.
The shell chops up to almost nothing, and I don't taste it.
I think you would be fine to "take" your calcium like that, but it would be difficult to swallow the gritty powder that would result from grinding up eggshells. I think that the reason people use lemon juice is for the ease of use rather than any need to for absorption. Seems like it would be easy enough to swallow in a glass of water, if a bit unpalatable.