It would take several pounds of them to really do anything. I can't find it now, but I had a link that did have the amount for banana peels, and it was pretty low. Eggshells do have more calcium and potassium than banana peels, but the peels do add organic matter. Composting them is good use for them, especially since they have been hit with at least one pesticide and probably a fungicide (or more) before they get to the store shelves.
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