Olaplex may be the first bond builder on the market, but it's no longer the only option — nowadays, there are many other bond builders to choose from, each with its own unique benefits.

Enter the Olaplex No.0.5 Hydrating and Strengthening Scalp Serum ($44), which I discovered at the perfect time to offset the scalp damage I've accrued during these brisk transitional months.

But fans of Olaplex No.3 have spotted it still included in the ingredients list of the bestselling hair product, causing concern about the formula online. But should you ditch your favourite hair ...