Karin Herzog Essential Mask - How can Karin Herzog improve her unique Mask, some people would think it impossible. However, the impossible has happened. Karin Herzog has added essential citrus oils to her already fabulous formula. Use this marvelous mask just the same way, only be prepared to see even more hydrated enhanced skin. You will love this new creation. The best quality of essential oils are taken from the skin of the fresh and ripe fruit, Grapefruit, Orange, and Mandarin.