Can Vitamin C serums be used with the NIA 24™ products?
Yes. You can layer a Vitamin C serum underneath the Skin Strengthening Complex or Sun Damage Prevention 100% Mineral Sunscreen SPF 30 because of the consistency of serums versus moisturizers and creams. However, when using NIA 24™ products in conjunction with other non-prescribed products, NIA 24™ products should be applied first because of their very efficient penetration properties and to ensure maximum efficacy.