Lactulose is well known for its pharmaceutical applications, particularly for its osmotic laxative properties and its role as a prebiotic in promoting gut health.
However, in recent years, Lactulose is attracting cosmetic industry interest for its unique properties, though more research and regulatory clearance are needed
Potential Applications and Mechanisms in Cosmetics
The application of lactulose in cosmetics primarily depends on two key attributes: its prebiotic nature and its humectant properties.
Prebiotic Function: Emerging evidence suggests that lactulose, as a topically applied prebiotic, may modulate the cutaneous microbiota composition, yielding measurable improvements in skin barrier parameters and inflammatory markers.
Humectant Properties: Like other sugar molecules, lactulose contains hydroxyl groups that enable it to attract and bind water molecules from both the atmosphere and deeper skin layers. This hygroscopic property qualifies it as a potential humectant, capable of enhancing stratum corneum hydration while reducing transepidermal water loss (TEWL). Consequently, lactulose may improve skin hydration, increase suppleness, and promote a smoother texture - offering benefits comparable to conventional humectants like glycerin or hyaluronic acid, with the added advantage of prebiotic activity.
Soothing and Anti-inflammatory Potential: Emerging evidence from broader biological studies suggests that lactulose may possess mild anti-inflammatory properties. Should these effects be demonstrated in topical applications, lactulose could prove valuable in skincare formulations targeting irritated or sensitive skin conditions, with potential benefits including erythema reduction and improved cutaneous comfort.
While comprehensive clinical data on lactulose's cosmetic applications are still developing, its validated roles as prebiotic and humectant scientifically support skincare formulation integration, aligning with contemporary microbiome-focused cosmetic strategies.
Scientific Support and Literature
While large-scale clinical trials specifically on lactulose in cosmetics are still emerging, there is foundational research that supports its potential.
Prebiotic studies: Studies on the gut microbiome have extensively documented lactulose's prebiotic effects. The principle of selectively feeding beneficial bacteria is translatable to the skin. Some in vitro and preliminary ex vivo studies have begun to explore the effect of various prebiotics, including sugars, on skin microbiota. For instance, Jung et al. (2019) in "Prebiotics in dermatology: a review" (Journal of the American Academy of Dermatology) discuss the general concept of prebiotics for skin, which indirectly supports the rationale for using compounds like lactulose. While not solely focused on lactulose, reviews on the skin microbiome and prebiotics offer a theoretical framework.
Humectant properties: The chemical structure of lactulose inherently suggests humectant capabilities, similar to other disaccharides. Comparative studies on the water-binding capacity of various sugars could provide more direct evidence.
Safety data: Extensive pharmaceutical use of lactulose provides a robust safety profile for internal consumption, indicating low toxicity. While topical application may have different considerations, this general safety profile is a positive indicator.
It's important to note that specific, peer-reviewed cosmetic efficacy studies with lactulose as a standalone active ingredient are less common compared to established ingredients. Most of the current evidence for its cosmetic use is extrapolated from its known biological and chemical properties.
Regulatory Status Across Key Markets
China: Lactulose is included in the "Inventory of Existing Cosmetic Ingredients in China (IECIC 2021)" (中国已使用化妆品原料目录). This means it is recognized as an approved cosmetic ingredient in China, and manufacturers can use it in formulations without needing a new ingredient registration, provided it complies with relevant safety standards and usage limitations (if any). Its IECIC number is 05584.
European Union (EU): Lactulose is listed in the CosIng database (Cosmetic Ingredients database), which is the official EU database for information on cosmetic substances and ingredients. Its INCI (International Nomenclature of Cosmetic Ingredients) name is Lactulose. This signifies that it is an accepted cosmetic ingredient within the EU.
United States (US): The US does not have a comprehensive "white list" of approved cosmetic ingredients like China or the EU. Instead, the FDA (Food and Drug Administration) primarily regulates cosmetics through post-market surveillance. Ingredients are generally considered safe unless proven otherwise. Lactulose is not explicitly listed in the FDA's Voluntary Cosmetic Registration Program (VCRP) ingredient database as a widely used cosmetic ingredient by manufacturers, but its use is not prohibited. Its status is generally "accepted" as long as it is safe and properly labeled.
Other Regions (e.g., Japan, South Korea): Lactulose is generally accepted in many Asian markets like Japan and South Korea, often following similar principles to the EU or having specific ingredient lists where it is included. Its widespread use in pharmaceuticals and its non-toxic profile contribute to its acceptance.
Conclusion
Lactulose's dual functionality as both a prebiotic agent and humectant establishes it as a multifunctional ingredient in advanced skincare formulations. Its regulatory clearance in key global markets (e.g., EU CosIng, US FDA OTC monographs) confirms established safety and bioactivity. Ongoing clinical research aims to elucidate its full potential in modulating cutaneous microenvironments and barrier homeostasis."
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Sources:
EU CosIng Database (https://ec.europa.eu/growth/tools-databases/cosing/)
Dermatologic Therapy (2018), "Prebiotics in Dermatology"
China IECIC (2021 edition)