Some HA fillers still not FDA approved contain substances to make the HA "last longer" and create some collagen production and/or give it a different viscosity. I have noticed some contain high viscosity cross linked HA AND Hypromellose, others HA and dextranomere microspheres (DEAE Sephadex). Are those products of the same family and/or imply the same risks that acrylates (PMMA and the like)?
Hugsssssssss
