It doesn’t have a list of ingredients. I think borax is the only ingredient. According to my dictionary, borax is a naturally occurring mineral.
(As are talc and asbestos).
We don’t have the same warnings on everything we purchase but eu (european union) regulations require that dangerous substances are clearly labelled. harmful substances (including borax) have a square orange box on the packet, with a large black cross in the box, to draw your attention to the warning. some warnings (not borax) have the word “irritant” if the substance is likely to react to your skin/eyes.
some manufacturers seem to live in fear of being sued. i believe that mcdonalds coffee has a warning that it is hot, following a case where someone sued because they burned themselves. i have also heard that a label on a new iron read “it is dangerous to iron clothes whilst wearing them”.