There is no poison in the seed of mangosteen, but it can't be eaten. Only the white pulp can be eaten, and the rest can't be eaten. Its seed surface is very smooth and has no edges and corners, so be careful not to swallow it when eating, especially for children.
The yellow things in the mangosteen can't be eaten. If the yellow ones are white, you can eat them. If there are yellow ones and the shells are very soft, it's suggested that you don't eat them. It means that they are too long and not fresh.
If you accidentally eat the seeds of mangosteen, don't worry too much, because the seeds themselves are non-toxic and won't be poisoned. They will wriggle with the intestines and discharge from the body.
