SEATTLE (AP) — Fire and medical officials have issued warnings about a supplement offered to Western wildland firefighters who have been exposed to toxic chemicals while battling some of the country’s biggest blazes.The supplement glutathione, given through an IV or an inhaler-like machine called a nebulizer, has not been proven to be safe or effective and could expose firefighters to illness if there is contamination while it’s produced, experts say. At least two pharmacies recalled the supplement in August due to bacterial contamination found during testing at their labs, with one saying it had received reports of people suffering from fever, chills, severe headache and other symptoms.“Because glutathione is not an FDA-approved drug, consumers should be cautious about product safety and claims that glutathione can treat or prevent diseases,” said a safety advisory issued last week by the International Association of Firefighters, a labor union representing some 360,000 first responders.

Warning followed supplement’s use during Spokane wildfiresGlutathione was offered to firefighters during recent blazes that destroyed hundreds of buildings in and around Spokane, Washington. During morning briefings, medical unit leaders on scene from California urged crews to check out a tent where a nonprofit run by licensed naturopathic doctors offered the supplement.