Are some collagen stimulators, while advertised as such, no really fillers?

Real collagen stimulators may provide some initial filling effect due to the fluid that surrounds the microscopic particles in the product (these prompt collagen to be made). “During the first 24 hours after injections, the fluid gets absorbed and the fullness that you initially see may start to dissipate. It takes time to stimulate new collagen for the full effects to show in the face, which can take a few months and a few treatment sessions.