Hydrogen is considered a vital solution for decarbonizing hard-to-abate sectors like heavy industry, aviation, and maritime industries. The demand for hydrogen is expected to increase significantly by 2050, with a substantial portion needing to be covered by low-emission hydrogen production. Research primarily focuses on estimating production potential, economic feasibility, technological challenges, and environmental impacts of green hydrogen. However, there are gaps in existing studies, particularly in categorizing the hydrogen value chain by segments and analyzing policies' role in fostering innovations along the value chain. The International Energy Agency emphasizes the need for effective government policies to accelerate hydrogen innovation and deployment. To address these gaps, a new study collected data on innovations and policies along the hydrogen value chain for 67 countries. The study aims to provide a granular analysis by examining policy impacts on innovation across supply-side, infrastructure, and demand-side segments. By utilizing tailored patent datasets and econometric methods, the study quantified the cumulative policy effects on innovations. The results offer insights for policymakers, highlighting the importance of tailored policies in advancing green hydrogen innovation globally.