What is the difference between collagen boosters and fillers? Which one is more natural?

The biggest difference is 'who creates the volume.' Fillers create an immediate shape with external substances like hyaluronic acid, while collagen boosters induce your skin to produce its own collagen. The self-collagen method is characterized by less foreign feeling when making expressions, but which method suits you better depends on the degree of hollowness and the area, so it is recommended to consult for judgment.