Thin/soft Shell in 20 month old RIR hen - but not all eggs

[JJandtheBoys]

Yes, Caltrate with D3 for humans. I would give 1 tablet orally once a day for 3-5 days. No more than 5 days.
Get hen. Stand her on a table, drape one arm over her, pull her to your body, with the hand of the arm draped over her grab her wattles, pull down, she'll open her beak, with the other hand pop the tablet into her beak, immediately release the wattles. She *should* swallow it unless you have a pill shooting hen on your hands - I've got one of those type of hens. Then you may have to get crafty and crush up the pill, mix it with some coconut oil, put it in the fridge, harden it up, break it up into chunks and see if she will eat it on her own. Fortunately my hens love coconut oil. It's Easy Peasy

Forgot to tell you THANK YOU for your help on this.
Great advise, and now I know how to solve thing shells and give a pill to a chicken.