Are you getting more than one thin/soft shelled egg from a hen, you may find it helpful to review the amount of calcium your hens get in their feed. You can buy grit or oyster shell from feed merchants, or you can recycle your own egg shells. Just bake them and then grind them up. These are all good solutions but the ultimate product that beats them all is Davinova C. People have noticed that their hen looks 'poorly' and is quiet and 'hunched up' for an hour or so before laying. The hen then makes a recovery and sometimes lays a soft egg. This is nothing to worry about, because Davinova C is formulated for this specific reason.

Forget about egg binding and help your offsprings build healthy bones & feathers.