The bespoke hair treatment celebs are loving RN by hellofashion.com / 29 September 2016 We've spotted a hair trend among the celeb set of Instagram right now - #FusioFriday. Created by luxury hair brand Kerastase, Fusio Dose treatments are positioned as bespoke 'rituals' mixed for your hair needs after a diagnosis with your stylist. It's an add-on to a salon blowdry and only costs £15, with visible results lasting for around five washes. And we've seen a whole host of celebs indulging in the treatment and sharing the results on Instagram – click through to see... Nicola Roberts. You can locate your nearest salon here. Read more about: Hair and beauty Lisa Snowdon. Samantha Barks. Poppy Jamie.