Amul has a large decentralized supply chain network comprising 3.6 million milk producers in Gujarat. Amul collects milk from village cooperatives and transports it to processing plants. The milk is then converted into products and distributed nationwide through regional centers to over 500,000 retail outlets. Amul faces challenges like declining milk production and rising costs, but addresses these through initiatives like farmer support programs and IT systems for efficient operations. Its cooperative model and focus on farmers has enabled Amul to become the largest food brand in India.