PhotoChitosan® is a purified and lyophilized methacrylated chitosan powder for photocrosslinkable hydrogels. PhotoChitosan® is a highly versatile solution designed for researchers and scientists seeking advanced materials for tissue engineering, drug delivery, and regenerative medicine applications. PhotoChitosan® provides 3D tunable gels with the unique attributes to be prepared at various concentrations and crosslinked to provide various gel stiffnesses. PhotoChitosan® is offered in convenient kits that include a selected photoinitiator, provided separately as a powder. This allows for customization and precise control over the crosslinking process. PhotoChitosan® is produced from deacetylated chitosan where the chitosan is then modified by reacting the hydroxyl groups of chitosan with the methacrylate functional groups, forming a strong covalent bond.