Decursin is a substance that promotes hair growth, especially in chemotherapy patients. Decursin is normally extracted from a rare seasonal flower in an expensive process, but students at Israel’s Technion Institute have just won awards by synthesizing it using enzymes from bacteria.

https://www.timesofisrael.com/technion-undergrads-wow-paris-meet-with-plan-to-reduce-chemo-induced-hair-loss/

https://www.jpost.com/health-and-wellness/article-720574