Interestingly, supplementation with DHBA failed to increase the level of ALT/AST, TNF-α/IL-6, or TGF-β1/α-SMA/COL1A1 in CCl4-challenged GPR81 KO mice (Supplementary Fig. 4A–C), suggesting that the detrimental effects of DHBA on CCl4-induced liver fibrosis depend on GPR81. Here, COL1A1 is linked to Hepatic fibrosis.