Degradation of BDDE-Crosslinked HA
In the previous sections, we reviewed scientific data suggesting that uncrosslinked HA, BDDE, and their metabolites are clinically safe at the concentrations used in HA fillers. After the crosslinking reaction, the chemical structures of BDDE and HA are modified to various degrees. In this section, we review additional preclinical data, which demonstrate that these molecular changes do not pose additional safety risks.