Our team advises applying our products on a thinnest-to-thickest basis. It's best to allow each layer to dry and absorb into your skin before applying the next product. Generally, serums will be applied first, followed by moisturizers.
Please call 1-800-787-7546 if you have any questions. We are open Monday-Friday 9am-5pm ET
Wishing You Beautiful Skin,
Peter Thomas Roth Clinical Skin Care