Hydroxypropyl cyclodextrin is a white crystalline powder that can be sourced either naturally or synthetically.
It is typically added to skincare products formulation as a fragrance agent or a formula helper. As a fragrance agent, hydroxypropyl cyclodextrin helps mask scents of other ingredients that might be unpleasant. At the same time this ingredient can stabilize a product formulation.
Science
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Matsuda, H., Ito, K., Taniguchi, K., & Tanaka, M. (1994). Application of 2-Hydroxypropyl- -Cyclodextrin to Perfumes and Cosmetics. In MINUTES OF THE INTERNATIONAL SYMPOSIUM ON CYCLODEXTRINS (Vol. 7, pp. 134-134). EDITIONS DE SANTE.