A federal appeals court on Thursday rejected a lawsuit to prevent manufacturers of aluminum foil from using it in dementia prevention.
Aluminum foil has been used for decades in homes and office buildings to protect against air pollution.
It is a key ingredient in air-tight seals used in many home insulation products.
It has also been used in other ways, including in dental sealants.
But the lawsuit filed by the American Civil Liberties Union argued that the law prohibits aluminum foil, which is a carcinogen, from being used in the prevention of Alzheimer’s disease.
The U.S. District Court for the Northern District of California on Wednesday declined to issue an injunction preventing the Food and Drug Administration from approving aluminum foil for use in dementia preventive measures.
It said the law does not prohibit manufacturers from using aluminum foil in other applications.
The ruling was a victory for the American Chemistry Council, which sued the FDA to block the use of aluminum in dementia control measures.
The agency had been working to approve aluminum foil as a dementia prevention measure since December 2013.