Science
Mechanism of Action
DHA reacts with amine functions on amino acids in the stratum corneum via a Maillard reaction, forming brown melanoidin pigments. This non-enzymatic browning mimics melanin, providing a tanned appearance that fades with skin cell turnover.
Research
Clinical Evidence
High confidence6%
Key findings
- 01 DermNet, In search of the perfect tan: Chemical activity, biological effects, business considerations, and consumer implications of dihydroxyacetone sunless tanning products
- 02 Dihydroxyacetone: An Updated Insight into an Important Bioproduct - PMC
- 03 Typology
- 04 DropBio
Transparency
Dusting Analysis
Dihydroxyacetone is an active ingredient in self-tanning products, requiring specific concentrations to achieve its intended effect, and is not typically used in trace or 'dusted' amounts.
The Formula
Formulation
Stability
DHA is optimally stable at pH 4-5, with solutions stable between pH 4-6; degradation occurs in more basic solutions. It is heat-instable and should be added during the final cool-down phase of formulation, requiring cool, dry storage.
Conflicts
- Primary and secondary amines
- Other nitrogen-containing compounds
- Oxidizing agents
- Metals (iron, copper, manganese, titanium)
- Alpha-hydroxy acids
- Titanium dioxide
- Zinc oxide
- Iron oxide pigments
- Certain perfumes
- EDTA
Safety
Safety Profile
CIR deferred evaluation as FDA assessed safety; approved for external use up to 15%. FDA warns against inhalation/ingestion. Studies suggest DHA may generate free radicals, potentially damaging skin components and limiting Vitamin D. Caution advised for pulmonary disease, rosacea, and dermatitis; generally avoided in pregnancy.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Dihydroxyacetone is a valuable active ingredient for achieving a temporary tanned complexion through a proven Maillard reaction, but requires careful formulation and use due to potential safety concerns.
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