Fungal probiotics boost animal health. There is potential for using fungus probiotics as feed supplements. Fungal feed additives, as we know from earlier research, increase antioxidant capacity and reduce inflammatory responses, which further improves animal health and growth performance. Fungi such as Saccharomyces cerevisiae, Antrodia cinnamomea, Aspergillus oryzae, etc. are rich in many functional groups like polysaccharides, adenosine, and laccases, which are important for the immune system, antioxidants, and anti-inflammatory properties. It also increases body weight and improves egg production. Any residues in feeds have an impact on the amount of feed used, how nutrients are used, and ultimately the health and productivity of the animals. Fungal feed additives are very valuable, therefore, it is important to understand how to use and protect them (as shown in Fig. 1).