(ShareCast News) - Sports nutrition company Science in Sport said its sales increased 19% during the first half of the year, driven by e-commerce.Sales for the six months ended 30 June 2015 rose 19% to £5.24m, with growth particularly strong in e-commerce from third-party e-tailers, the group's website and in international markets.Full-year results are expected to be weighted towards the second half of the year, the company added.As a result, Science in Sport remains confident of its outlook for 2015 and beyond.Shares were up 5.34% to 69p on Tuesday at 09:36.