From around the age of 25, the production of hyaluronic acid in the body gradually but consistently decreases. Consequently, the substance’s proportion in the body diminishes. The consequences may include drier eyes, as well as creaking and less mobile joints. The loss of hyaluronic acid is also clearly visible, especially in the skin: Alongside the degradation of collagen, there is a decrease in the “filling material” that gives the skin its firmness. The skin loses volume and seems to shrink. This leads to gravitational folds: The facial tissue starts to yield to gravity and begins to sag.