The Ordinary Retinol 0.5% in Squalane 30mlThe Ordinary Retinol 0. 5% in Squalane 30ml Retinol 0. 5% in Squalane is The Ordinary's mid strength retinol serum the second step in a three tier retinol progression (0. 2% 0. 5% 1%). At this concentration, pure retinol delivers significant acceleration of cell turnover and collagen support, making it appropriate for users who have already acclimatised to the gentler 0. 2% formula. Suspended in squalane, a non comedogenic plant derived emollient, the