“…Further, these inartificial substances are eco‐friendly and cost‐effective. Multiple kinds of research have been considered to elucidate the mechanism of the proteolytic activity of broccoli (Sun et al., 2016 ; Wang et al., 2004 ), green asparagus (Ha et al., 2013 ; Mazaheri Kalahrodi et al., 2020 ), ginger (Ha et al., 2012 ; He et al., 2015 ; Sullivan & Calkins, 2010 ; Tsai et al., 2012 ), soy sauce (Kim et al., 2013 ), and vinegar (Mazaheri Kalahrodi et al., 2020 ; Żochowska‐Kujawska et al., 2017 ), individually or simultaneously.…”