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Moumoujus

FUCOSYLLACTOSE.

Valuable CAS 41263-94-9 / SKIN CONDITIONING, SKIN PROTECTING

Fucosyllactose, specifically 2'-Fucosyllactose (2'-FL), is a potent human milk oligosaccharide (HMO) that acts as a skin-identical ingredient. It precisely targets key biological pathways to enhance skin health, promoting robust barrier function, deep hydration, and significant skin brightening through melanin degradation, while also supporting a balanced skin microbiome.

Summary

skin-identical ingredient moisturizer humectant skin protecting prebiotic skin brightening anti-melanogenic barrier strengthening anti-inflammatory antioxidant wound-healing

Science

Mechanism of Action

2'-Fucosyllactose operates through multiple precise mechanisms to optimize dermal function. It initiates melanin degradation by activating the AMPK-ULK1 signaling pathway, leading to autophagosome formation and subsequent breakdown of melanosomes. As a prebiotic, it selectively promotes beneficial skin commensals, thereby modulating the microbiome to improve resilience and reduce reactivity. Furthermore, 2'-FL strengthens the skin barrier by upregulating essential proteins such as filaggrin, claudin-1, and occludin. Its anti-inflammatory properties modulate reactive pathways, reducing redness and sensitivity, and it contributes to overall skin integrity through potential antioxidant and wound-healing actions, partly by modulating skin pH.

Research

Clinical Evidence

High confidence
Effective range 0.1–4%
Optimal

1%

Key findings

  1. 01 Observed as a general usage rate in cosmetic products, contributing to melanin degradation and moisturizing effects.
  2. 02 Significantly decreased melanin levels in mouse B16 cells after 7 days of treatment and reduced skin pigmentation in a human skin 3D model, demonstrating potent brightening capabilities.
  3. 03 In leave-on products, clinical assessments revealed significant improvements in skin hydration, a reduction in transepidermal water loss (TEWL), and decreased sensitivity scores. Research using reconstructed human epidermis models demonstrated enhanced expression of key barrier proteins including filaggrin, claudin-1, and occludin.
  4. 04 Significantly reduced skin pigmentation in a human skin 3D model after 7 days of treatment.

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0.5%
Red flag below
0.1%

While Fucosyllactose is noted for general cosmetic usage from 0.1% for mild effects, significant clinical benefits in hydration, barrier function, and reduced sensitivity are observed starting at 0.5%. Formulations containing less than 0.1% likely offer negligible benefits, while those between 0.1% and 0.5% may provide only limited efficacy.

The Formula

Formulation

Solubility
Water
Optimal pH 3 – 9
0 7 14

Stability

Stable across a broad pH range of 3-9. It should be incorporated into the water phase of a formulation. To maintain optimal efficacy and prevent degradation, avoid exposure to temperatures exceeding 40°C and add as a final step during formulation.

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
3%
Sensitization risk Low

Fucosyllactose (2'-FL) holds multiple Generally Recognized As Safe (GRAS) statuses from the FDA for various food applications, including infant formula, demonstrating a robust safety profile for internal consumption. For cosmetic use, it is considered a safe and effective agent with minimal to no cytotoxicity at concentrations up to 2%, with maximum topical use generally cited at 3%. COSMILE Europe indicates 'No penalty' across all safety categories.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Fucosyllactose is a highly valuable, multi-functional ingredient that significantly enhances skin health by improving barrier function, deep hydration, and brightening, while robustly supporting the skin microbiome.

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