Science
Mechanism of Action
This ingredient operates primarily as a bacteriostatic and fungistatic agent, meaning it inhibits the proliferation and growth of microorganisms such as bacteria, fungi, and yeast, rather than directly eliminating them. Its efficacy is attributed to its active form, Dehydroacetic Acid, which disrupts microbial metabolic processes.
Research
Clinical Evidence
High confidence0.6%
Key findings
- 01 Demonstrated effective antimicrobial activity against both bacterial and fungal species in cosmetic applications, establishing it as a reliable preservative.
- 02 Isolated instances of hypersensitivity were observed in patients with compromised skin (chronic leg ulcers) using creams formulated with this concentration, though overall sensitization risk is considered low at standard usage levels.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium Dehydroacetate is freely soluble in water. While the optimal pH for its antimicrobial activity (as Dehydroacetic Acid) is between 2.0 and 4.0, a formulation pH of 4.5-5.0 is recommended for improved overall efficacy. It exhibits stability up to 80°C, though incorporation during the cool-down phase below 45°C is often advised to prevent potential discoloration. As a basic ingredient, it can slightly increase the pH of formulations. There is a risk of slight yellowing over time, especially when exposed to high heat or anionic ingredients (e.g., certain surfactants or carbomers); this can be mitigated by co-formulating with antioxidants like tocopherol. Nonionic and anti-inhibition agents may inactivate it.
Synergies
- Antioxidants (e.g., Tocopherol) to mitigate discoloration
Conflicts
- Nonionic ingredients (potential inactivation)
- Anti-inhibition agents (potential inactivation)
- High heat (may amplify discoloration)
- Anionic ingredients (may amplify discoloration)
Safety
Safety Profile
The CIR Expert Panel has consistently affirmed Sodium Dehydroacetate as safe for cosmetic use at current concentrations and practices, a conclusion reaffirmed in 2023. It is largely considered non-irritating, non-sensitizing, non-photosensitizing, and non-phototoxic in numerous tests, with minimal skin absorption. While the FDA permits its use as a preservative in specific food applications, European Union regulations limit its use to 0.6% (as acid) and prohibit its inclusion in aerosol dispensers. Hypersensitivity reports at 3% concentration in compromised skin populations are noted, but these are rare given its widespread use at lower, regulated concentrations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Dehydroacetate is a valuable broad-spectrum preservative, ensuring product stability and safety at concentrations up to 0.6% with a generally low risk of irritation or sensitization.
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References
Sources