Covered Gray Hair PPD Free, Ammonia Free Amino Acid + Herbal Extracts No PPD, no ammonia to minimize hair damage and scalp irritation. This product nourishes your hair through the directly-decocted oriental herbal extracts of Korean ginseng, Cnidium Officinale, and Artemisia. It also contains Keratin to protect your hair from hair dye damage, and a natural moisturizing substance (PCA) provides stronger moisturizing effect to the hair.