Phyto comes from the Greek word “phyton” which means “plant”. When you see the word “phyto” is means that the product or ingredient comes from a plant source. We call our serum Phyto-Retinol because the main ingredient, bakuchiol, is a plant-derived retinol alternative.BIOSSANCE LAB NOTES: Retinol for EveryoneClick here to view the Phyto-Retinol Serum