Coconut milk

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

In-game examine text: "A vial filled with coconut milk"

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 1 gp, and item ID 5935.

View on OSRS Wiki

Coconut Milk shows an active flip setup with a margin of +44 gp and 84,116 trades over the last 24 hours.

At the buy limit of 11,000 every four hours, max profit per cycle is about 484.0k gp — high margin with healthy liquidity.