Really strange, but I tried yogurt and it helped. I bought the 20 for $20 yogurts at publix and fed them 1-2 a day. It seemed to help after about a week. I eventually ran out, but didn't have any problems after that. You could also try calcium supplements. I think you can buy tabs that go in their water.I'm about at my wit's end on what to do about two of my hens egg shells being way too soft. I have had free choice oyster shell out in their coop and run without any change. Yesterday I started adding another feed that has more calcium so I hope this helps. If y'all have any suggestions to help our girls, please let me know.