Cadantine

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

In-game examine text: "A powerful herb."

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 39 gp, and item ID 265.

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Cadantine currently has a flip margin of −26 gp, which isn't profitable to flip right now despite 364,870 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.