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Factors to consider when choosing an hyaluronic acid (HA) filler
| Concentration of HA |
| Cost |
| Choices of syringe size |
| Degree of crosslinking |
| Design of the syringe |
| Duration of correction |
| G prime (stiffness) |
| How much of the HA is crosslinked vs uncrosslinked |
| Hydration level of product in the syringe |
| Presence of lidocaine |
| Required needle size for injection |
| Sizing technology |
| Type of crosslinking technology used |
