Volufilline and Tret combinability

[crvecell]

I’m going to buy volufillinebut im using .5% Tret rn and im no going to stop using it. I want to know how to use both at the same time, do I use Tret on my face first or vice versa, or each ones on different days. Also volufilline recs are welcome, don’t know which one to buy to get rid of my stress lines and get better skin.