Luteolin was a natural flavonoid that was widely found in many plants.[40,41] Luteolin has a variety of biological effects, such as anti-inflammatory, antioxidant, and anticancer.[42] Luteolin was found to improve collagen deposition effectively, transforming growth factor-β1 (TGF-β1) expression and pulmonary fibrosis in the lung tissues of mice induced by bleomycin (BLM), and similar results were found in vitro studies. Here, TGFB1 is linked to pulmonary fibrosis.