Combined microbiome and metabolomics analysis of yupingfeng san fermented by Bacillus coagulans: insights into probiotic and herbal interactions 1College of Veterinary Medicine, Henan University of Animal Husbandry and Economy, Zhengzhou, Henan, China 2College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi, China DOI 10.7717/peerj.19206 Academic Editor Liang Wang Subject Areas Microbiology, Veterinary Medicine, Drugs and Devices, Immunology, Pharmacology Keywords...