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The alternative protein industry is only as strong as its underlying ingredients. This report explores the 2025?2031 trajectory of the plant-based protein ingredients market, where the focus moves beyond soy toward more functional, allergen-friendly sources. We analyze the dominance of pea protein and the investment in wet-milling facilities to improve taste and texture. The narrative details the emergence of secondary proteins like chickpea and mung bean, which offer unique emulsification properties. We also examine the critical issue of bioavailability?ensuring plant proteins are easily absorbed through advanced fermentation. The report highlights the localization of the supply chain to reduce the carbon footprint and price volatility of imported ingredients. By 2031, the ingredient market will be defined by functional diversity, providing food scientists with a vast toolkit of plant-based options to create the next generation of meat mimics.