Guam leaf

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

In-game examine text: "A bitter green herb."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 1 gp, and item ID 249.

View on OSRS Wiki

Guam Leaf shows an active flip setup with a margin of +18 gp and 135,691 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 234.0k gp — high margin with healthy liquidity.