Our Story

Science in Sport plc is a leading sports nutrition business that develops, manufactures and markets innovative nutrition products for professional athletes, sports and fitness enthusiasts and the gym lifestyle community. The Company has two highly regarded brands: PhD Nutrition, a premium protein brand targeting gym lifestyle and sports enthusiasts, and SiS, a leading brand among elite athletes and professional sports teams.

The two brands are sold internationally through multiple retail channels, both traditional and online, including major supermarkets and high street chains, specialist sports retailers and e-commerce sites including Amazon and the brands' own websites. They enable the Company to address the full breadth of the performance nutrition market currently estimated at approximately £10 billion worldwide.

PhD is one of the UK's leading protein brands with a reputation for high quality and product innovation. The brand has grown rapidly, based on its core protein powders, since launch in 2005. The range now comprises powders, bars, flapjacks, drinks and other products including the high protein, low sugar range, PhD Smart. PhD is the exclusive sports nutrition supplier to David Lloyd Clubs and its brand ambassadors include rapper Bugzy Malone, WBA international champion Jordan Gill and Team GB Olympic sprinter Asha Philip.

SiS, founded in 1992, has a core range comprising gels, powders and bars focused on energy, hydration and endurance. SiS is the official sports nutrition supplier to many professional cycling teams and organisations including Team INEOS, British Cycling, Cycling Australia, USA Cycling and USA Triathlon. SiS supplies more than 80 professional football clubs in the UK and is an official partner to British Triathlon and the Rock 'n' Roll Marathon Series. SiS brand ambassadors include Olympians Sir Chris Hoy MBE, Mark Cavendish MBE and Adam Peaty MBE.

Science in Sport is headquartered in London. Its shares joined the AIM market of the London Stock Exchange in August 2013 and trade under the ticker symbol SIS.

Our Brands

We have an unrivalled range of premium sports nutrition products in our portfolio which are sold under the PhD and SIS brands globally through digital and retail channels.


SiS is a leading endurance nutrition brand with a reputation for scientifically developed products which are trusted by elite athletes. SiS products, including energy powders, isotonic gels, energy bars and supplements, are targeted at elite athletes and fitness enthusiasts.


PhD is a leading protein brand with a reputation for high-quality innovative products. PhD products, including whey powders, supplements and bars are aimed at sports enthusiasts and gym lifestyle consumers.

Our Approach

From our manufacturing base in Nelson and six offices around the world, our international team of world-beating nutritionists, scientists and technicians work side-by-side with elite athletes in every field to deliver innovative performance nutrition products tested to the highest standards that
enable peak performance.

We partner with elite athletes and teams around the world to consistently develop, test and market new products. We deliver them to our growing global customer base through our market-leading e-commerce platform and international retail partners.

Our Ambassadors and elite teams

Science in Sport plc has teamed up with some of the world’s leading athletes, artists and teams, across a wide-range of sports, to develop innovative sports nutrition products that help them achieve their goals.

Sir Chris Hoy

SiS ambassador Sir Chris Hoy is a six-time Olympic track cycling gold medalist and Britain’s most successful Olympian.

Bugzy Malone

Bugzy Malone is a superstar musician and influencer and a PhD brand ambassador.

Manchester United

SiS are proud to be official Sports Nutrition Partner to Manchester United Football Club.

Adam Peaty

Adam Peaty MBE is an Olympic and World Champion swimmer and SiS ambassador.

League Clubs

Aston Villa, Celtic, Rangers and 85 of the professional league clubs use SiS products.

Beth Potter

SiS ambassador Beth Potter competed at the Rio Olympics and is a long-distance runner and triathlete.

Richard Commey

PhD ambassador Richard Commey is a world title contender in the lightweight boxing division.

Vikki Thornewell

PhD ambassador Vikki Thornewell is a leading Bikini Fitness athlete.

Innovation and Integrity

Science in Sport is committed to developing the world’s most innovative performance nutrition products, enabling our customers to achieve their performance-driven goals.

Our sports nutrition experts work closely with elite athletes, such as Sir Chris Hoy and Adam Peaty, to extend and improve our extensive range of nutrition products.

The PhD and SiS ranges are trusted by professional and Olympic athletes and fitness enthusiasts across the world. A key component of this trust is our approach to preventing banned substances entering our supply chain and finished products. We work closely with the world’s leading sports federations and anti-doping agencies, and rigorously and routinely test our products and premises for quality and adherence to the strictest anti-doping criteria.

This standard of testing is carried out by a very small proportion of the sports nutrition industry and no other brand globally holds both the Informed Sport Site Certification and Informed Sport Product Certification.