Gallic acid, a major chemical component of QLX, was reported to inhibit NF‐κB expression and activation followed by down‐regulation of IL‐1, ILI‐6, IL‐12, IL‐17 and IL‐23, TGF‐β and TNF‐α expression in ulcerative colitis.40 Here, TGFB1 is linked to ulcerative colitis.