It is really hard to say for certain about any wood or wood product. There are too many potential variables really and not enough information. For people beech causes sensitivity and nasopharyngeal cancer. This however is mostly contact with bark leaves and sanding dust, none of which is likely to be in a bag of chips. Beech has a lower aromatic phenol than pine does so likely it is ok. In reality 'safe' is not black and white but a whole set of degrees. IMO beech should not pose to be more of an issue than populars (of the genius populus there are too many species and common names to be certain of whom is speaking of which.) which are so common around reptiles.
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