Thin eggs all of a sudden

[Flybybirds]

I have Chocolate Orpington Hens. They have always done well but here lately they have had thinner than normal eggs. The shell itself is stable but thin. I haven't changed anything in their diet or water source. I have them on a multivitamin supplement. What else can I do?

 

[MysteriaSdrassa]

Oyster shells,,, you can feed it free choice or add small amounts to your feed. I prefer offering free choice,,, the hens know when they need more and will adjust the amount they intake on their own.