Chris Beekman, whose company sells the dietary supplement Opiate Detox Pro, does not understand what all the fuss is about.

“If it works, it works,” Mr. Beekman, the owner of NutraCore Health Products, said in an interview. “If it doesn’t, it doesn’t.” His customers, addicts trying to shake a dependence on opioids, can always get their money back, he said.

Opiate Detox Pro’s label says, “Opioid addiction ease,” and the company’s website claims, “Our ingredients are the most effective on the market for treating withdrawal symptoms.”

Mr. Beekman said he did not have scientific evidence to prove that the product worked, and would not be conducting research to buttress the company’s claims.