No, mangosteen seeds are generally considered nonedible.
While some sources might suggest that mangosteen seeds can be consumed, the reference material states explicitly that the tiny seeds found within the edible aril are nonedible. The aril, which is the white, fleshy part of the mangosteen fruit, is the portion considered edible and is known for its sweet and slightly sour taste. The seeds themselves are small and hard, and while they might not be toxic, they are not palatable and are best avoided.
