Science
Mechanism of Action
This keto-sugar interacts with free primary or secondary amino groups present in keratin within the uppermost epidermal layers, a process analogous to the Maillard reaction. This non-enzymatic browning leads to the formation of brownish polymers, known as melanoidins. These melanoidins then bind primarily via lysine side-chains to proteins in the stratum corneum, producing a natural-looking brown color on the skin.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Formulations containing 1-5% Erythrulose initiate a self-tanning effect within 2-3 days, achieving maximal intensity in 4-6 days. The resulting tan typically endures for 2-10 days, presenting a natural, even, and long-lasting appearance without streaks. It contributes a cooler brown tone, minimizing the risk of an orange hue, and is associated with less skin drying than dihydroxyacetone (DHA).
- 02 At concentrations of 1-3%, Erythrulose produces a lighter and slower-developing tan, which may contribute to reduced skin surface dryness and a smoother fading tint. When co-formulated with DHA, the synergy extends tan longevity, improves fade quality, and enhances the overall cosmetic appeal of the color.
Transparency
Dusting Analysis
Erythrulose is a well-researched active ingredient with a defined mechanism and effective concentration range for self-tanning. Its inclusion at sub-efficacious levels would not yield the intended cosmetic benefit.
The Formula
Formulation
Stability
Optimal stability for Erythrulose is maintained within a pH range of 2.0-5.0, with a slightly acidic pH of approximately 4 being beneficial for stability and preservation. For extended shelf life, a pH between 2.0 and 3.5 is recommended. The ingredient becomes unstable above pH 5.5, potentially hydrating into an aliphatic tetra alcohol. It must be incorporated into formulations at temperatures below 40°C and requires un-buffered acidic systems to maintain integrity.
Synergies
- Dihydroxyacetone (DHA): When combined with DHA, Erythrulose enhances tan longevity, improves fade quality, and contributes to a more cosmetically pleasing color.
Conflicts
- Compounds containing nitrogen functional groups (e.g., amines, including PVP, tertiary amines like EDTA)
- Oxidizing substances
- Inorganic oxides (e.g., TiO2, ZnO, iron oxides, Al2O3)
- Hydroxyl-acids
- Phosphates
- Buffering agents used at higher pH values
Safety
Safety Profile
Erythrulose is broadly recognized as safe for cosmetic use, demonstrating low irritation potential and non-toxicity. Regulatory bodies such as the Cosmetic Ingredient Review (CIR) and SCCS have approved its inclusion in both leave-on and rinse-off products. It is suitable for sensitive skin and does not elevate sun sensitivity. However, it is important to note that the Food and Drug Administration (FDA) has not yet approved Erythrulose as a self-tanning agent.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Erythrulose is a valuable self-tanning active, delivering a natural, even, and long-lasting tan with minimal irritation and reduced dryness, making it an excellent choice for a cosmetically elegant bronzed appearance.
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References
Sources