Marrentill

Marrentill is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "A herb used in poison cures."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 3 gp, and item ID 251.

View on OSRS Wiki

Marrentill shows an active flip setup with a margin of +9 gp and 152,158 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 117.0k gp — high margin with healthy liquidity.