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He said this may be an unintended consequence of the government’s recent clampdown on cutting agents such as benzocaine.

Warren said the condition had been triggered by a numbing agent containing benzocaine.

Doctors determined the woman developed methemoglobinemia after using “large amounts” of topical benzocaine, which she said she used the night before her hospital visit.

But there was something in those little brown squares — the supplement first included benzocaine, an oral anesthetic that would presumably numb the taste buds.

Regulators have issued multiple warnings about benzocaine but deaths have continued.