This toner is the best toner I've found so far for lowering the ph of the skin after cleansing.
It is, at least for my skin, not strong enough to exfoliate that much on its own, so for exfoliating I am using different acid toners such as P50, Ordinary's Glycolic Toner, Salicylic & Lactic Acid.
However, prepping my skin for these exfoliating toners was the sole reason for buying this, and it happens to be a great prepper as the ph is ca. 4 which makes the acidic actives / treatments following just SO effective!
I need to use this because my facial cleanser has a ph of ca. 5,5, and together with the limey water here it leaves the skin way too alcalic for ANY acid active to do its job! Hence the Cosrx AHA/AHB Clarifying Toner.
(My normal toner is Missha Time Revolution TONER and I am using this every time I will not follow with any acids in my regimen. It's ph 5 and better for retinol (wait 10-15 minutes after it anyway, so the skin ph will go up to ca. 5,5 ph) - so the retinol can do its job properly).
Would definitely buy again, the ingredient list is pretty good, and also it doesn't contain Niaciminde, which would prevent me from using anything Vit C-ish afterwards. This little bottle is perfect!!