Question about feeding dried egg shells

[Charisse66]

My chickens are 19/20 weeks old and one of my hens started laying yesterday yay!! So I have oyster shell supplement separate and they pick at it a bit so I started drying and crushing egg shells for them- man do they love them. My question is: should I be careful on how much I give them? I read too much can hurt them. BTW my sex link hen started laying after giving this, maybe a coincidence. Help, I don’t want to hurt my babies

 

[nuthatched]

Mine prefer flakes oyster shell, itight be Wirth a shot.
Their own egg shells won't hurt them unless they get an impaction, so I'd definitely limit their access.