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.


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 4.3 out of 5 by 55 reviewers.
Rated 4 out of 5 by Tacky but terrific Try and sample and see if you can handle the tacky feeling overnight along with the pillow deal that so many others posted about. Using it regularly really does make you look tighter and smoother with smaller pores. It's fabulous. Rotate with midnight recovery serum and you can take all that money you were going to use on laser treatments and treat yourself to a day at the spa! 13/01/16
Rated 1 out of 5 by This serum doesn't do anything to me Excited to try this product, but disappointed the first week, being patient used a couple more weeks, still doesn't do anything to me, not like kielh's other products. Bought it online, couldn't return in store. No time to wrap up bring to the shipper. Anyway, I wouldn't recommend it. 29/11/15
Rated 4 out of 5 by younger skin I use this product 2-3 times a week. I can feel my skin being softer and brighter in the morning after each use. It doesn't have any particular smell so I like it and it doesn't hurt my skin (I'm combination+sometimes sensitive skin). I have acne problems and I think this product helps me "refresh" my skin once in a while. 29/11/15
Rated 2 out of 5 by Eh.. When ever I purchase a Kiehl's product, I make sure to stack up on some samples and the Overnight Biological Peel happened to be one of them. However, after using it, I was very disappointed. It's meant to be slept in, but this is so annoying to do. The product remains wet and sticky and so is your pillow as soon as you lie on it, and by morning almost all the product is now on your pillow instead of your face sooo this "amazing skin by morning" idea was not the case for me. In fact, my skin looked exactly the same as it did before I even used it. Anyway, I used the product 2 more times (I had more samples) and was disappointed after those uses as well - I even thought my dark spots looked darker. It was weird, so I had to go back to the Clearly Corrective Dark Spot Remover to rescue me. I was quite disappointed with this one, but I recommend trying a sample of this before purchasing the full thing to see how your skin reacts to it. 24/11/15
Rated 5 out of 5 by Fave Kiehl's Product Ever! I have had really bad acne for all my teenage years as well as now into my adulthood. I recently went to the Kiehl's store & picked up this product with an array of other products. This one has by far showed the best results. I was at first, nervous because I didn't have a exfoliator that was a scrubbing action. But with this guy, I notice changes over night & it helps to heal my acne while leaving it smooth for the next day. 14/08/15
Rated 4 out of 5 by glowing fresh face Easy to apply, not sticky, does not dry out skin especially around nose and eyebrows where I often have trouble. Love the gentle but effective rejuvenation. 08/07/15
Rated 4 out of 5 by Helps keep skin smooth I really like this peel. It seems to help me get rid of blemishes faster and exfoliate for better overall skin texture. 07/07/15
Rated 1 out of 5 by Don't see any results really... not sure how long should i wait to see any results . My skin is very sensitive and i was looking for a peel that not is gonna be too strong for my skin. So i chose this one. The texture is weird. Its too thick and its not comfy to sleep bc it stays on my pillow case ... And i think it makes my skin even worse. I will try to use it longer but i feel bad paying this much and don't get any results . Really happy for those who does see it. 02/04/15
  • 2016-02-06 T08:44:29.480-06:00
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