Supplements, gels, bars, mineral salts. Sis - Science in Sport has everything you need for practicing sports. SiS is a strong brand in the elite athletic community - at the 2012 London Olympics, 24 medal-winning athletes and teams used their products .. Founded in 1992, SiS is headquartered in London, the goal is to offer athletes an assortment of nutritional products that help them achieve maximum performance. To avoid running into doping problems, all SIS products are externally validated by a first-rate doping control laboratory, LGC Sports Science.