Kiehl's Ultra Pure High-Potency 9.8% Glycolic Acid Serum, Concentrated Face Serum to Exfoliate for Glowy Skin, Visibly Smooths Skin Texture & Boosts Skin Glow, All Skin Types, Fragrance-free - 1 fl oz

Visible difference. I use it morning and night. Well worth the money!

I ordered this because of the great reviews, but also because after research, found it had a relatively low PH so I figured it would be stronger. But..the best part - it sinks into the skin quickly - and is not sticky at all. So far - I am loving it.

Really does the trick to the skin as it is used with 2 other skin regiments in the morning and my skin Les smoother and firmer

Fast shipping. Delivery was great. Started using it but only 3 days in. My skin feels great so far. No adverse reactions. I’ll update as use goes on!

Makes my skin feel buttery soft. Good value for the size, shipped quickly will buy again.

Love this. Works great! Skin softness

Great product will purchase again!

This 9.8% glycolic acid serum from Kiehl's is not for the weak or the sensitive-skinned. It's a very potent formulation and features a high concentration of chemical exfoliant to make your skin glow and look nice and glassy. It can sting and even burn if used correctly or absolutely ruin your skin barrier. Do NOT use this with any other actives such as vitamin C or retinoids unless you want to have a very bad time. :) Also if you have angry red mountains on your skin, don't use this unless you want them to turn into volcanoes. Use only on unbroken skin. I am not sensitive at all and it stung when applying. I followed up with hyaluronic aid and a thick moisturiser before bedtime to seal in the ingredients. After a week, my skin does look much more radiant and my pores look much smaller so I'm very pleased with the results. If you have to use this in the day, please wear sunscreen! The formulation was fragrance-free and vegan so there is a lot to love about how this is formulated. I think as long as you're careful, this exfoliating serum will work wonders for those trying to achieve the glass skin effect. But if you are sensitive by any means or have broken skin, please don't use this. It's not suitable and the packaging should be updated to reflect how strong this really is. It can melt your face off if you're not careful!

Amazing stuff

Es hat bei mir einwandfrei funktioniert.

Ich benutze das Serum jetzt seit ein paar Monaten und bin wirklich zufrieden. Meine Haut ist deutlich glatter geworden und wirkt viel frischer. Kleine Unebenheiten sind fast ganz verschwunden. Ich habe schon einiges ausprobiert, aber das hier zeigt endlich richtige Ergebnisse. Es zieht schnell ein und reizt meine Haut überhaupt nicht. Ich benutze es abends und merke morgens immer, wie weich meine Haut ist.

This is a 10, I have a bumpy forehead that always looks thicker and darker than my cheeks, but after 2 days of use of this serum, I already see a difference, my skin has a better texture, less oily, and even color. I am very happy with the product.

Makes my skin flawless 🫶🏽