Repurposing groceries for use in your bathroom isn’t a new idea, but it is enjoying a resurgence. Look at the uptick of beauty tips online: co ee scrub to fade stretch marks, onion water to spur hair growth, yogurt face masks. Now, several cosmetics brands have latched on by developing new products with classic kitchen ingredients. So is it worth home-brewing, or should you go the ready-made route? I enlist my husband to give it a try. He reports his normally oily skin feels ‘very clean’, and we both notice he’s more matte than usual. This porous powder is used to absorb toxins, says Elizabeth. ‘In beauty products, it could draw debris and oil out of your skin or scalp,’ she says, but there’s no research to con rm this. So I become a one-woman study. Do it yourself: Besides the mess, the mask I make by mixing the jet-black powder available at health shops with aloe vera doesn’t do my dry skin any favours. For a more moisturising version of the treatment, Joanna suggests adding soothing yogurt and honey. Sounds promising, but I’m too busy cleaning my sink to go for round two – or to try the charcoal hair treatment I spot online. Leave it to the experts: Dermalogica Charcoal Rescue Mas ue clari es with charcoal and sulphur and doesn’t leave my skin tight. And my thick curls bounce and shine after I wash with charcoal-infused, residue-removing Hask Charcoal Purifying Shampoo.