“Hopefully their victims can find some solace in today’s outcome,” Mr. Homer added.
The four men, who were convicted by a jury in July and represented themselves in court, could not immediately be reached for comment on Friday evening.
The sentencing capped a three-year-long case in which the Grenons were accused of selling the treatment, named “Miracle Mineral Solution,” online under the guise of a church called Genesis II Church of Health and Healing, which Mark Grenon had co-founded. The product, they claimed, could cure Covid-19, Alzheimer’s disease, diabetes, H.I.V.-AIDS, and leukemia among other serious diseases, prosecutors said.
The solution contained sodium chlorite and water, which becomes chlorine dioxide when ingested orally, prosecutors said. Chlorine dioxide is a strong bleach used for industrial purposes.
Beginning in 2019, the F.D.A. had warned the public against using the product, according to a criminal complaint. When the coronavirus pandemic began in 2020, the Grenons started to market it as a cure for Covid-19, the authorities said.
Prosecutors filed charges against the Grenons in June 2020, and they were indicted the following year.