Over-Night Biological Peel

Stimulates natural exfoliation of skin. For sensitive skin.
This potent, effective peel for overnight use stimulates the desquamation process - the biological means by which skin restores itself. Our treatment is formulated with naturally-derived ingredients to enhance formula efficacy while performing a safe and gentle peeling action. Urea, an enzyme activator naturally present in the surface layer of the epidermis, performs the vital function of dissolving and loosening the horny layer of skin, stimulating cell renewal and the exfoliation of dead surface skin cells. Blended with HEPES (Hydroxyethylpiperazine Ethane Sulfonic Acid) and a high concentration of Sodium Hyaluronate, known for its powerful hydrating properties, our peeling treatment helps to gently renew skin, leaving texture softer, more even, and vibrant after first use. With continued use, the formula helps reduce the look of pore size and ameliorate the effects of free-radical and photo-damage. Non-comedogenic, oil-free, and dermatologist tested for safety and efficacy. May be used by all skin types.
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HEPES, or Hydroxyethylpiperazine Ethane Sulfonic Acid, is a chemical buffer which is widely used in cell culture to maintain physiological pH. This amino-sulfonic derivative helps to improve skin and limits roughness.

Sodium Hyaluronate

Sodium Hyaluronate is the sodium salt of Hyaluronic Acid. It is used as a moisturizing agent, viscosifier and emulsifier. It forms a transparent film on the skin which has a soothing and lubricating action. It is a powerful humectant as it is capable of binding 1,800 times its own weight in water. See also: Hyaluronic Acid.


An enzyme activator naturally present in the surface layer of the skin (epidermis), Urea accelerates the natural process of cell renewal through the exfoliation of dead surface skin cells. The ingredient has a water binding effect in the top layers of the skin thus acting as a natural moisturizing agent in human skin.

Rated 5 out of 5 by 7 reviewers.
Rated 5 out of 5 by Excellent product. Speaks for itself after the first use! I love this product. When I first read about it I thought it was expensive for such a small bottle but a little goes a long way. The product feels smooth to apply and dries quickly. It does not flake or crack once it dries and does not transfer while your sleeping. My skin is very temperamental and this product is gentle enough to use every second day. It leaves my skin feeling fresh and radiant which gives me more confidence through my day. I would recommend this product to everyone man or woman, it's easy and enjoyable to apply and just splash your face with warm water to rinse it off. This product is amazing please never stop making this product!!! 06/08/13
Rated 5 out of 5 by Great, amazing product! When I first read about this product, I was a bit skeptical that something as affordable as this would work. I read the reviews however and decided to give it a try. No joke, this stuff worked the very first time I used it! I was amazed! It does EXACTLY what it is suppose to do. I swear, I put it on before bed the same night I bought it, woke up, washed it off... The tone of my skin was definitely more even, little red marks had faded, my skins looked so radiant and clear... I was shocked. I've used it about three or four times since buying it, and honestly my skin looks completely renewed and healthy an radiant. All red marks have vanished, and my skin feels so soft and firm while glowing. I highly recommend this product to EVERYONE. It works. And it's worth every penny. Not only is this item amazing but I'm now a believer in Kiehls. About two months ago I switched from using high end department store brands, to using Kiehls Ultra Facial Cleanser, UF Moisturizer and the Bilogical Peel, and it's like a miracle. Everyone concerned about their skin should use these products! 05/09/12
Rated 5 out of 5 by WOW!!! I love this product - it's wonderful for us older gals too. It's the best peel I've ever used and I've used many over the years but had sworn off them. First off it totally non-irritating, and two drops is enough for each application so it's fabulous value. I used it overnight, although the salesperson at Kiel's informed me that leaving the peel on for three hours has the same effect. I awoke to fabulously moist skin and my skin looked brighter after just one use. It will definitely become part of my weekly regimen, along with my other Kiehl's products. 14/01/12
Rated 5 out of 5 by It works first time & every time! Renewed texture & tone after the first morning, and with continued use, faded redness and acne scarring on parts of my face...it's smooth, potent but gentle, and it works...1-2x a week is all I need to never buy another topical peel again! 31/10/10
Rated 5 out of 5 by the only one as sensetive skin person, i am very glad to try this product which worked perfectly on my skin..i loved it.. i feel my face and neck are even now..thank you K 25/09/10
Rated 5 out of 5 by Great! I have normal, sometimes sensitive skin. Standard exfoliators wreck my skin but this stuff is magic. I use it 3x/week and never wake with any redness or irritation. My skin looks fresh and glowing, feels soft, and I can see and feel a difference in its texture. I use only two pumps to cover my face completely so this bottle is lasting a long time and very good value. I cannot say enough about how adding this to my routine has changed my skin for the better. 13/09/10
Rated 5 out of 5 by More than I expected Easy to apply. Wake up looking like you really had a chemical peel over night. Very rejuvenating. 12/09/10
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