INGREDIENT · POLYHYDROXY ACID
Lactobionic acid in skincare: the gentle acid, tested
Lactobionic acid is sold as the mild acid that also hydrates. The studies are small and mostly use peels, so the evidence is for what the acid does, not for how much.
You may see it written as
- Lactobionic Acid
What lactobionic acid is
Studies group lactobionic acid differently. A 2018 study of lactobionic acid peels introduces it in the context of polyhydroxy acids, which have gained attention for dry skin.1 A 2019 study calls it a cosmeceutical active and a "superacid" belonging to the alpha-hydroxy acid class.2
What the hydration studies show
A 2018 study of 10 people aged 26 to 73 compared 10% and 30% lactobionic acid peels on each half of the face over eight weekly treatments, plus a 5% cream at night. Skin hydration improved significantly with both, and the two concentrations could not be told apart.1
A 2019 study of 20 women compared a 20% peel with a 20% peel combined with aluminium oxide crystal microdermabrasion over six weekly treatments. Hydration rose and water loss fell, and elasticity improved. The combined side had higher hydration, and slightly higher water loss because of more exfoliation.3
Skin pH and irritation
A 2019 study tested a 10% lactobionic acid emulsion made with sugar-based emulsifiers. In lab tests and in a 24-hour occlusive study in people, it showed a satisfactory safety profile on skin water loss, hydration and redness, and it lowered skin surface pH one hour after application.2
How to read this
The studies suggest lactobionic acid can hydrate and acidify skin without obvious irritation. They are small and short, they used professional peels more than daily products, and only the pH study also tested the plain cream base, and only for irritation.2
Using lactobionic acid with other products
The 2019 peel study combined the acid with microdermabrasion in one procedure.3 That was a professional treatment on one side of the face, not layered products at home.
Lactobionic acid in pregnancy and breastfeeding
We found no pregnancy- or lactation-specific evidence for this ingredient.
Evidence on cosmetic products in pregnancy is limited overall, so ask your doctor or midwife about the specific product you use.4
What you will see on the label
The names to look for are Lactobionic Acid. In Snifff, it reads as Low risk. For the rest of the formula, see what the score means and how to read the list.
As Snifff shows itLactobionic Acid
Pregnancy and nursing
We found no pregnancy- or lactation-specific evidence for this ingredient.
Wording as it appears in the extension, which can change between releases.
A FEW MORE ANSWERS
Common questions about lactobionic acid
Is lactobionic acid an AHA or a PHA?
Studies group it differently. A 2018 study discusses it in the context of polyhydroxy acids, and a 2019 study describes it as belonging to the alpha-hydroxy acid class.1,2
Does lactobionic acid hydrate skin?
In small studies, peels with 10%, 20% and 30% lactobionic acid improved skin hydration.1,3
Does lactobionic acid irritate skin?
A 2019 study of a 10% emulsion found no irritation and no barrier impairment.2
Is lactobionic acid safe in pregnancy?
Snifff found no pregnancy-specific evidence for Lactobionic acid. Ask your doctor or midwife about the product you use.
WHERE THIS COMES FROM
Sources
- Comparative evaluation of skin moisture after topical application of 10% and 30% lactobionic acidAlgiert-Zielińska B, Mucha P, Rotsztejn H · Journal of Cosmetic Dermatology · 2018
- A 10% lactobionic acid-containing moisturizer reduces skin surface pH without irritation: an in vivo/in vitro studyTasić-Kostov M, Lukić M, Savić S · Journal of Cosmetic Dermatology · 2019
- Effects of lactobionic acid peel, aluminum oxide crystal microdermabrasion, and both procedures on skin hydration, elasticity, and transepidermal water lossAlgiert-Zielińska B, Mucha P, Rotsztejn H · Journal of Cosmetic Dermatology · 2019
- Cosmetic dermatology in pregnancy and lactation: a risk-benefit framework for clinical practiceKovacs T, et al. · International Journal of Dermatology · 2026
This page explains an ingredient. It is not medical advice, and it is not an assessment of any product. If you are pregnant, breastfeeding, or have a skin condition, ask your doctor or pharmacist.