Filler Science: G Prime & Cohesivity

In the properties of the fillers. They change certain things. How much cross linking they put in it, how much lubrication they put in with it, how dense they make it. But they're pretty much all about that 2% hyaluronic acid. There's really no difference from that standpoint. And they have two properties that the companies look at. One's called G prime, which means its ability to resist force might be that pushing on a balloon, and some might be pushing on a basketball or even like a bowling ball. So the higher the G prime, the higher the stiffness. It's an elasticity component. Does it compress? The other one is called cohesivity. Does it stick together? These properties are varied based on individual products. We might want to alter them so they're less stiff and less cohesive. For certain areas, like say, under the eyes, you wouldn't want any stiffness or any cohesivity. On lips, we wouldn't want really stiff. We want it to be nice and soft.