Dietary and topical ascorbic acid have beneficial effects on skin cells, and some studies have shown that vitamin C may help prevent and treat ultraviolet (UV)-induced So collagen is what gives the skin its firmness, but it’s HA that hydrates and nourishes the collagen. So if you think of collagen as a rubber band that is stretched a million times, eventually it’s going to get dry and brittle. Consider the HA as the water that keeps the collagen moist and elastic. So as we age it’s important to help the skin regain as much moisture as possible. Hyaluronic Acid serves to act as a space filler by binding to water and thus keeping the skin more wrinkle free.