GNC Holdings, a worldwide retailer of health and wellness products with more than 7,100 locations, filed on Tuesday with the SEC to raise up to $350 million in an initial public offering. The Pittsburgh, PA-based company, which was founded in 1935, booked $1.8 billion in sales for the 12 months ended June 30. Goldman, Sachs & Co. and J.P. Morgan are the lead underwriters on the deal, for which pricing terms and timing were not disclosed. GNC had previously filed to go public in June 2006 before postponing the deal the following August.