Our cat probiotic tablets contain vitamin B2, yeast selenium. It can help improve your pet's immunity and build up resistance. Its use is simple: feed directly or mix with meals; Pets <5 kg (wear -5 months old)2-4 tablets/day; Pets 5-10 kg (5-12 months old)4-6 tablets/day; Pets >10 kg (adult)4-8 tablets/day. And can support vision and skin health.