Yup, doing that now, with my Neocell Collagen 1&3 in it for my joints. When we were cleaning out the garden yesterday, I pulled a big clump of grass that the tiller missed and gave it a toss over the high fence. Something in the shoulder joint right in the front popped loudly and painfully, not the first time that's happened, so it's very sore this a.m. Hopefully, my daily collagen will help it heal up quickly. I quit taking my NSAID arthritis meds about a year ago when Ladyhawk suggested the collagen supplement her bodybuilding lady friends swore by. After a few months, I dumped the meds. My ankle quit swelling up badly and has lots more flexibility. That stuff has done so much more for my ankle (the one I broke badly about 7 years ago) than any twice a day NSAID, which would do nothing for my joints and tendons and may eventually hurt my liver. Anyway, enough commercials! We get enough of those on what my dad called the idiot box.
As far as heat for chickens, naturally a well-feathered chicken is well-insulated and needs no heat. But, a chicken with no feathers can't keep warm well. That's why last winter, I put one of Atlas's daughters in the hospital cage with a reptile bulb over her and a bed of hay until her feathers began to cover her. Didn't take long. She was almost completely naked. And, for example, Neela, one of the blue Rock hens, has severe arthritis in one hock joint, plus is so thin now, she is a bag of bones with feathers. I'm not sure exactly why. She has a cyst that blocks off one of her nares and one of those weird cyst things on her tush like my late Ellie did (I did a thread on what I found when I cut that open, very strange!). So, poor Neela gets at least one place she can sit under, if the mean ones like Wendy will let her. Her sister, Alice, is always by her side. I sort of expect to find Neela gone one morning. She is 7 1/2 so not young by any stretch.