Klair's supple preparation toner has been one of my holy grails for a long time, but this has overtaken it. Firstly, the bottle is huge, and I only use a splash each time so this will last ages. The ingredients list is quite simple, and it contains 0.15% citric acid which causes the least amount of irritation amongst the AHAs. It's very watery (unlike the viscous texture of the supple prep toner) and absorbs very quickly, letting you get on with the rest of your routine, so makes a daily exfoliating step very easy. It's not super hydrating, so I use this first, and then pat on a bit of a hydrating toner or essence. After a week of using this, my skin feels soft and supple. I feel like my other products have become more effective too and are sinking in better. Really recommend! I'll be buying another one after this one finishes!