Kevin.Murphy Damage.Manager. Instant Heat Shield. Allantoin - Allantoin is extracted from the roots and leaves of the comfrey plant which has long been used to expedite healing and moisturizing. A native of Europe, this member of the borage family contains a substance called allantoin that encourages cell growth and is easily absorbed through the hair to stimulate hair growth. The Kevin Murphy X-HP complex provides unrivaled defence against the intense heat genrated by modern appliances while delivering impressive style hold. This product offers X-treme Heat Protection, protecting hair at temperatures up to 428F. Arnica Root Extract - A natural herb that helps prevent inflammation and properties healing. The soothing, moisturizing, and softening properties of this treatment combined with its ability to promote healthy cell renewal, makes it an ideal component.