For years, I have used the combination of hyaluronic acid fillers with collagen-stimulating fillers such as Sculptra and Radiesse, and it has given me a predictable outcome.
Sculptra is a liquid of polylactic acid, lidocaine and water for injection. Radiesse is a calcium hydroxyapatite dissolved in a gel. Both substances are fully biodegradable fillers and have been on the market for a very long time. Sculptra since 1999. Radiesse is just a little bit younger.