(CNN) -- GNC has filed for bankruptcy and will close up to 1,200 stores.
The 85-year-old vitamin and dietary supplement company has been saddled with nearly a billion dollars of debt.
GNC has faced declining sales at its brick-and-mortar locations since before the pandemic.
However, GNC said that stay-at-home orders during the COVID-19 pandemic had a "dramatic negative impact" on its business.
GNC will continue operating, but after closing 20-percent of its retail stores, it will become a smaller company.
The company hopes to emerge from bankruptcy this fall.
A list of stores slated for closure is available on the GNC website. Locations in Carbondale, Ill. and Cape Girardeau, Mo. are on the list.