"I've experimented with so many DIY recipes over the years, and I've finally whittled it down to one foolproof concoction. Take an avocado that's on its way out (if it's perfectly ripe, eat it!), a big spoonful of honey, a shot of apple cider vinegar with 'The Mother', and an egg. Blitz it all in the blender, apply to dry hair and leave for an hour with a shower cap to lock in the moisture. Rinse out with lukewarm water first — any hotter and the egg will cook in your hair — then shampoo out with warm water. The avocado delivers fatty oils to nourish dry hair, the egg provides protein and omega 3 for repair and elasticity, the vinegar clarifies the scalp and strands, and the honey gives some lightweight moisture." — Ava Welsing-Kitcher, freelance beauty journalist