you can always get a powderd vitamin and use a touch of oil on the feed and sprinkle it on. of course they sell red cell which some fanciers use, it is a product for horses, used in the water maybe once a week. but those are not home remedies, but easy.My question is what vitamins or things I can use to build up a yb's immune system? I used garlic and acv already. Is there anything else (home remedies) that I can use? Any answers will be appreciated.