Spent Grain Isolate Market to Reach USD 737.1 Million by 2036 as Upcycled Protein Innovation and Circular Economy Adoption Accelerate Global Demand Brewer’s Spent Grain to Hold 68% Source Share in 2026, Wet Extraction to Account for 46% Share, High Purity Isolate Above 80% Protein to Lead with 48% Share, While South Korea Emerges as the Fastest-Growing Country at 18.4% CAGR ROCKVILLE,...