By Elliot Gulliver-Needham Protein shake maker Applied Nutrition is set to include millions of retail shareholders in its planned £500m float as soon as this week. The sports nutrition brand is set to muscle its way onto the public markets in collaboration with Peel Hunt-backed Retailbook, according to reports from Sky News. Last month, the firm confirmed plans for a £500m IPO before the end of the year after “stand-out” growth in the 12 months to July. “To support our ambitious plans in the coming years, we continue to lay the groundwork ahead of our potential IPO on the London Stock Exchange…