Yes, people can eat basic magnesium carbonate gym chalk. It would be a good idea to be near a toilet when you do. Magnesium carbonate works as a laxative and antacid. While it is not advisable to eat chalk, in this case it can be done, it just should not be done because it can have impurities and harmful substances.
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It is not it harmful to breathe magnesium carbonate gym chalk. However, one should be cautious so as not to breathe in excessive quantities.