If there were a way to find out if this only uses powdered milk, we could possibly import them into Israel (Chief Rabbinate only allows cholov stam/nochri imports using powdered milk, not real milk)
If bleach and laundry detergent need, by any measure, a hechsher, it seems this is more justified as the mask sits on your mouth the entire time and you are breathing in the air you breathed out against it... but still, why dairy???
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