"I have a really sensitive scalp and aerosol sprays frequently dry it out and make my head itch like crazy. When I found the Briogeo Scalp Revival Charcoal + Biotin Dry Shampoo (£21.50) I was relieved. When you squeeze the soft bottle, a puff of dry shampoo powder comes and after being rubbed in, absorbs all of the oil in my hair and gives my strands awesome volume. I love how well it cleans my hair without irritating my scalp. It's also better for the environment and cruelty-free which is always a plus!" — Sarah Siegel, former assistant editor, Beauty