Feel, the UK-based digital health company, is on a mission to clean up the ‘dirty’ world of nutritional supplements and, following an exceptional first year of growth, the  producer of the world’s cleanest, highest-quality supplements, has closed a £4.5million investment, led by Fuel Ventures and includes TMT Investments, Sova VC, Richard Longhurst (founder of LoveHoney.com) and Igor Ryabenkiy (founder and GP of Altair Capital).