Global Protamine Zinc Insulin Injection market size is valued at USD 1.15 billion in 2025 and is projected to reach USD 1.74 billion by 2033, advancing at a 5.2% CAGR as affordability takes precedence in LMICs and veterinary use widens. Growth outlook is driven by WHO pre-qualification pushing tenders, biosimilar momentum lowering ASPs by ~4% p.a., and government capitation programmes in India, Brazil, and Nigeria. The market forecast reflects accelerating industry expansion in Asia-Pacific, where diabetes prevalence is rising 1.5ร faster than the global average, while price erosion in Europe and North America tempers value gains. Key forces shaping the segment include: (i) regulatory harmonisationโstringent GMP audits and pharmacovigilance for protamine content; (ii) supply-chain regionalisationโAPI re-shoring to reduce 35% import dependence on China; and (iii) competitive intensityโNovo Nordisk, Sanofi, and domestic players (Glenmark, Biocon) vying for volume share, pushing product differentiation through recombinant PZI and pen-delivery formats. North America retains the largest revenue share (38%) on high veterinary pricing, while South Asia is the fastest-growing region (>7% CAGR) on tender-led human consumption.