Shampoo and conditioner must essere complemented by a deep treatment suitable for giving vitality to the hair. The Doctor Keratin + Arginine + Biotin Maximum Energy And una A keratin mask that stimulates and energizes hair. It not only treats hair, but also adds strength and volume. It's ideal for those who want healthy, shiny hair. Its composition has been designed to offer maximum effectiveness thanks to the combination of active ingredients such as arginine, keratin, and biotin. Thanks to its special silicone-free formula, the mask penetrates deep into the hair. struttura of the hair and leaves it soft and nourished.