By Amber Murray Nutrition specialist Science in Sport has said it is confident that the business will “return to growth” after a sharp drop in revenue during the first half of the year. The London-listed company, which sells a range of protein powders, electrolyte products and nutritional supplements, said that revenue fell by 25.4 per cent to £25.7m in the six months ended 30 June. Gross profit fell by 20.8 per cent to £11.5m. The board said the drop was due to a restructuring toward a royalty based model in certain export regions. It has also made “significant operational cost savings” in th…