GlaxoSmithKline is recalling all supplies of its non-prescription weight-loss drug Alli in the United States and Puerto Rico after customers reported finding other pills and tablets in some bottles. The news is a fresh blow for a product once touted as a potential blockbuster but which has had disappointing sales over the years – aggravated, in part, by a separate supply problem two years ago. The British group said it believed that some U.S. bottles of Alli might not contain authentic product, adding that it was working with the U.S. Food and Drug Administration on the retailer-level recall. News that bottles had been tampered with first emerged on Wednesday.