I'm not an expert on this, but I'm sure that Saypha Filler is of very good quality and the recovery period after these injections is quite short. I didn't feel any side effects, so I can really recommend these fillers. I bought them on one site, here
https://fillersupplies.com/product/saypha-filler/ , by the way, there is more detailed information and a description of these fillers. I was attracted by reviews about them, where they wrote that they are really high quality and can be bought at an affordable price.