The value or longevity of a Hyaluronic Acid filler (HA) is determined by the amount of cross-linking of the gel molecules. The body is very effective at removing things that do not belong. The beauty of HA is that it is also produced in the body so that it can stay because it is not a completely foreign object. Collagen that used to be injected was from cow hide so that it was rapidly identified and then broken down by the body. It also required a test to determine if you had an allergy.
HA is not broken down by this pathway, it is broken down other ways. The more solidly (or crosslinked) a HA product is the longer it will last. The absolute amount of HA in a syringe does not translate into more product remaining in an injected area. ONLY the crosslinked amount of HA in the syringe will actually remain. The non-crosslinked product will be disolved in a few days. The non-crosslinked HA is smoother and allows for easier injection and some controllability in some hands but will NOT contribute to longevity.
