I recommend Bibib Lab low-molecular collagen.

Collagen cannot be obtained solely through food and requires the help of medication. Since absorption rate in the body is important, the size of the molecule is crucial. Plant or fish collagen, which are lower in molecular weight, are considered better than large meat collagen. Lower molecular weight collagen is absorbed more easily, improves skin elasticity, provides moisture, and protects the skin from ultraviolet rays. Collagen plays a role in the skin's defense barrier.

According to my research, VIVILAB contains 1500mg of low-molecular-weight fish collagen and 30mg of vitamin C, which helps synthesize collagen. I decided on this one because without vitamin C, collagen intake would be useless.