Firefighters battling large blazes face risks from toxic chemicals. A supplement called glutathione is being offered to some, but experts warn it may not be safe.

Contamination during production is a concern, and some pharmacies have already recalled the supplement due to bacterial contamination. People who used it reported symptoms like fever and severe headache.

Further information about the supplement and the warnings from officials is available, including details about the recalls and the potential health risks associated with its use.