Which calcium + vitamin D3 for chickens?

[ChasingChooks]

What brand of calcium + vitamin D3 do you give to your hens? (when needed).

The first has less calcium, while the other one has less D3.

Or do you use a different one altogether? Thinking this would be very handy to have on hand. I only have calcium/magnesium pills right now, which is what I use when I have a girl that needs calcium.

Thanks!

 

[RoyalChick]

I use these because it is calcium citrate which is supposedly better absorbed than calcium carbonate, and because they are small oblong pills that are very easy to pop into a beak.

 

[ChasingChooks]

Thanks!