Collagen P.I.N. produces results through the stimulation of growth factors and collagen, thereby promoting new skin cells to surface. As our skin ages, our collagen production naturally slows down. Your overall result will last longer when using an at home skin care regimen that includes a daily Retinoid product. Your provider is best suited to make this recommendation. New collagen & elastin formation in the skin are documented as visually and measurably improved as much as one year after just one treatment. However, a series of treatments is typically recommended for best results.