Yes. Is it one with Vit D3 included? That's best. I like to administer at night when the chickens are on the roost, much better than chasing in the heat of the day and trying to catch one. They can die of heat stroke that way and it really stresses them. Just pull down on her wattles to get her to open her beak and pop it in, she will swallow it no problem. A chicken can swallow a whole mouse so don't worry about it. Do this for 3 nights and see if she improves and report back.Is it okay to use a 500mg one ? That’s all I have right now