Lian Yu herbs can heal almost any type of poison and infection. These herbs are so effective, Oliver took some of them from the island to help him in his crusade against crime.
These herbs are capable of curing infections, injuries and most types of poisons, making them very effective tools for Oliver to use during his crusade. These herbs were capable of curing Slade's infection, as well as Sara Lance's pit viper venom and Oliver's curare. Although the latter took hours to regain consciousness while the former regained consciousness in mere seconds. This suggests that curare is much stronger.