What vitamins do you give your chickens? & can you use it with ACV?

[kuntrychick]

Is Vi-Tal ok? How often do you use it? Do you only use it in extreme temperatures or when things change (like adding or removing birds from the flock)...any possible stressors for them?

Thanks!

 

[Ohhhdear]

I add backstrap molasses and ACV to their waterers.