In September, we explored the applications of photostimulation in hydrogels. Light-induced reactions are commonly used in various fields, including dentistry, coatings, and beauty salons. In biomedical research, natural components like collagen and hyaluronic acid have been modified to react to light exposure. These modifications, along with the use of photoinitiators, allow for better control over the processability and viscoelastic properties of hydrogels. This control is essential for applications such as in vivo injection, 3D bioprinting, and matching the mechanical behavior of implantation sites.