I'm a huge fan of Olaplex products, and whenever I spot a new one that I haven't used, I always like to give it a try (budget permitting!)
Although Olaplex products are of course, extremely expensive, I like to purchase them whenever I can considering how much bleach I have on my hair. When I go to the salon, I often pay extra for Olaplex, and continue the Olaplex process at home with the shampoo, conditioner and No.3 mask.
The Olaplex No.9 Bond Protector Nourishing Hair Serum is priced at £28 on LOOKFANTASTIC, which I originally thought was pretty steep before I used it and noticed its genuine benefits. Its described as a 'weightless leave-in hair serum' that promotes shine and offers heat protection.