In the suit filed Monday in Superior Court in Camden County, N.J., Romero accused Ergopharm and Proviant Technologies as being negligent in manufacturing 6-OXO and 6-OXO Extreme, the nutritional supplements he took, and for misrepresenting their ingredients.

Also named in the suit are Vitamin Shoppe and General Nutrition Centers, stores where Romero said he purchased the over-the-counter supplements in July. He said employees at both stores recommended the supplements and assured him that using them would not lead to a failed drug test.