PhD Nutrition is a UK-based active nutrition company founded in 2005 by Jason Rickaby and Mark Bowering. Headquartered in London, it has become one of the UK's leading brands in protein and sports nutrition, operating in over 45 countries worldwide. The company is known for its premium and innovative products aimed at sports enthusiasts and those leading an active lifestyle.

PhD Nutrition offers a diverse range of products that support health, fitness, and performance. This includes a diet range designed to help build lean muscle and manage weight, health optimization products like plant-based meal solutions and formulas for mental performance, and high-protein, low-sugar snacks and bars. Additionally, the company provides performance supplements tailored for training and recovery. Acquired by Science in Sport plc in 2019, PhD Nutrition continues to grow, with reported revenues of approximately £17.9 million in 2021.