It is safe to use them if your skin is used to both of these ingredients
doi: 10.3389/fphar.2022.856111 Received 16 January 2022 Accepted 15 February 2022 Published 08 March 2022 Volume 13 - 2022 Edited by Giuseppe Paolisso, University of Campania Luigi Vanvitelli, Italy Reviewed by Stefano Ciardullo, University of Milano Bicocca, Italy Maria Rosaria Rizzo, University of Campania Luigi Vanvitelli, Italy Updates Copyright 2022 Pahud de Mortanges, Sinaci, Salvador, Bally, Muka, Wilhelm and Bano
For instance, waiting 15 minutes after applying your vitamin C serum before using copper peptides in the morning may work, but most people don't have an extra 15 minutes every day to do this consistently
Nelson RL, Thomas K, Morgan J, Jones A
doi:10.1016/j.bbr.2019.112359 84