Best For Skin Types
All, Dry, Sensitive, Combination
Addresses
Usage Frequency
Daily
What Is Lactitol?
Lactitol is a sugar alcohol (polyol) derived from lactose, commonly used in skincare as a humectant and skin conditioning agent. Like other polyols such as glycerin and sorbitol, it has a molecular structure that allows it to attract and bind water molecules, making it useful in formulations designed to improve skin hydration.
In cosmetic products, lactitol works by drawing moisture from the environment and deeper skin layers to the surface, helping to maintain skin's water content. It also has mild skin-conditioning properties that can help improve the overall feel and texture of skincare formulations.
How It Works
Lactitol is hygroscopic, meaning it has an affinity for water molecules. When applied to skin, it draws moisture from the deeper layers of the epidermis and from the surrounding air, helping to plump and hydrate the outer skin layer. This action reduces the appearance of dryness and can temporarily improve skin smoothness and texture.
Unlike some other humectants, lactitol's mode of action is relatively straightforward — it functions primarily through water-binding rather than through deeper metabolic pathways. This makes it a gentle, well-tolerated option in skincare formulations.
Clinical Evidence & References
Lactitol's use in skincare is well-established in the cosmetic industry, though dedicated clinical studies specifically examining its efficacy in skincare products are limited in the published literature. Its effectiveness as a humectant is supported by its chemical properties and widespread use in formulation, but robust comparative data against other polyols is sparse.
The ingredient is generally recognised as safe for topical use and is unlikely to cause irritation in most individuals. However, individual skin responses can vary, and more targeted clinical research would help establish precise efficacy claims for specific skin concerns.
Published Research
How to Use
Lactitol is typically found in serums, moisturisers, and hydrating toners at concentrations that support its humectant function. For best results, apply lactitol-containing products to clean, slightly damp skin to maximise water absorption. It works well in layered routines — apply before heavier creams to allow the humectant to do its work, then seal with an occlusive if needed in dry conditions.
Safety & Precautions
Frequently Asked Questions
From the Clinic
Not sure what your skin actually needs?
Two minutes, a few questions, and we’ll point you at what matters — no guesswork.
Take the skin quizRelated Ingredients
L-Mandelic Acid
Gentle AHA ideal for sensitive and darker skin tones
Lactamide Mea
A multifunctional humectant and conditioning agent for hydration and texture
Lactic Acid
A gentler AHA that exfoliates and hydrates at once
Lactobacillus
Typically made by fermentation of simple organisms Helps condition and bind moisture to skin
Lactobacillus/Coconut Fruit Juice Ferment Filtrate
Result of combining lactobacillus bacteria + coconut juice Blend starts a fermentation process that releases natural sugars
Lactobacillus/Rye Flour Ferment
Non-living probiotic made by fermenting rye flour with Lactobacillus Works as a humectant to draw and hold moisture to skin
Learn More About Skincare Ingredients
Explore our comprehensive ingredient glossary to understand what's in your products.
Browse All IngredientsShop Our Products
Find professional skincare solutions at Skintique.