I have a small flock of Rhode Island Reds, 5 hens and a roo. My lovely ladies are excellent layers, even with it currently being winter in Minnesota, I still get 4 to 5 eggs a day from my girls. We are looking to get them calcium supplements, as they are craving calcium, and they don't seem to be getting enough from the eggshells we have been giving them every day. Our local feed store sells big bag calcium supplements made from oyster shells, which I know is fine for the birds. My main concern is whether or not oyster shell calcium supplements will make the eggs unsafe for me to eat, because I have a severe shellfish allergy. Does anyone know how oyster shells affect egg quality (besides helping make stronger shells)? Would be self-defeating if I have a steady supply of eggs but still have to eat store-bought because my own might kill me...?