Can I use other skin care products along with Collagen Aktiv? How often should I apply Collagen Aktiv?

Yes, but be sure to apply them AFTER applying Collagen Aktiv, otherwise, they will inhibit the absorption of Collagen Aktiv to your skin. And don’t wait too long after cleansing your skin to apply product. The oil glands of certain skin types quickly replace excess oil removed during cleansing, and these secretions may prevent Collagen Aktiv from penetrating the skin properly.
Collagen AKTIV application twice a day is sufficient. In the case of severe sunburn, more frequent applications may be necessary.