Quillaja Saponaria (Soapbark) Wood Extract. Quillaja trees grow in a managed plantation in Chile consisting of trees that are systematically pruned to achieve large amounts of biomass –the whole plant is used in the extraction of Quillaja Saponins. The Quillaja is classed as ‘wild harvested’. The extraction factory is environmentally optimised and has won awards for this. This food-grade extract, together with wild harvested Soapwort extract, allow us to create a rich and stable gel for our Papaya & Bakuchiol Gel Serum, without the use of traditional petroleum-derived gelling agents, lanolin or palm derivatives.