For those who have received the Revicol treatment, how satisfied are you and how effective have you felt it?

Lately, my skin elasticity has dropped rapidly, and fine lines and internal dryness have worsened, so I am looking into various skin boosters.

Among them, the Revicol procedure, which has recently been gaining popularity through word of mouth, caught my eye.

I looked it up and heard that unlike typical liquid skin boosters, Rivicol works by directly replenishing the dermis with high-purity collagen. I am really curious to know the overall level of satisfaction among those who have actually used it.
I would like to know if I can feel an immediate increase in volume or skin density without looking as unnatural as fillers.

Also, I would like to ask those who have actually received the treatment how many sessions (treatment cycles) are usually required to see clearly visible results, and roughly how long the effects last.