In typical Inkey List fashion, the brand has found an exciting ingredient to feature in its newest launch, the The Inkey List PCA Bond Repair Hair Treatment (£13). "We came across this ingredient about two years ago and found it really interesting," co-founder Colette Laxton told POPSUGAR. "PCA is used in Brazilian hair salons because the bond-rebuilding formulas we're familiar with here don't work as well on really thick, coily, kinky hair. PCA, on the other hand, truly works on all hair types."
"PCA is a really short, highly-penetrative molecule, and this is why it's different to other things like out there," says co-founder Mark Curry. "Because it's short and because of the way it interacts with the hair filament itself means that it doesn't just work on disulphide bonds (like most bond-building treatments), it works on the water bonds and ionic bonds as well, which is why it will have an instant effect in terms of smoothing frizz and flyaways." This is a good thing because when it comes to curly, coily hair, disulphide bonds are hard for products to reach. "If you imagine straight hair, product can get to every part of the strand," explained Curry. "But if you put a bend in the strand, you lose about 25% of that surface area." The fact PCA repairs all three types of bonds in the hair means that people with curly and coily hair will see better results versus a product that only treats disulphide bonds.
With all the science-y bits out of the way, here's the TL;DR: This leave-in treatment works really, really well. Just spray it on freshly-washed hair and you'll notice once your hair dries (whether by air or dryer), that it looks smoother and feels stronger — almost like how your hair feels after it's just been cut.