False-coloured scanning electron micrograph showing the surface of a single strand of hair which has been heavily bleached and straightened ... heating and drying can over time damage the hair shaft ...

This leaves the hair shaft vulnerable, leading to moisture loss and protein damage. The result? Brittle, fragile strands that ...

It also contains other hydrating ingredients like coconut and sunflower-seed oil and glycerin, which are particularly beneficial to severely bleach- and color-damaged hair. It used to be available ...