Science
Mechanism of Action
Hexamidine, including its salt forms, functions as an antiseptic and disinfectant by targeting microbial cell integrity. It binds with high affinity to negatively charged bacterial cell walls and membranes, inducing disruption, inhibiting oxygen uptake, and causing amino acid leakage. Additionally, it possesses anti-inflammatory effects, enhances skin barrier function, and can mitigate skin aging by inhibiting serine proteases associated with skin inflammation.
Research
Clinical Evidence
Medium confidence0.1%
Key findings
- 01 A clinical study involving 200 human subjects demonstrated that Hexamidine Diisethionate at 0.10% did not induce primary irritation, inflammation, or sensitization.
- 02 Research indicates Hexamidine Diisethionate effectively functions as a biocide in cosmetic formulations at concentrations between 0.03% and 0.1%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Hexamidine salts maintain chemical stability within a pH range of 3.0 to 6.0. Exposure to pH above 6.0 leads to rapid degradation via hydrolysis, while gradual hydrolysis occurs below pH 3.0. Formulations may require pH adjustment using appropriate acid, base, or buffer systems.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded Hexamidine and Hexamidine Diisethionate are safe at concentrations up to 0.1% when used as cosmetic biocides/preservatives. While much of the detailed safety assessment refers to Hexamidine and Hexamidine Diisethionate, 'Hexamidine Diparaben' is specifically identified as a paraben-type preservative, necessitating careful consideration for 'paraben-free' claims and regulatory scrutiny by some health ministries. Although sensitization is not common, there have been reported cases of allergic contact dermatitis, photosensitivity, and contact sensitivity associated with Hexamidine and Hexamidine Diisethionate. The CIR Panel also emphasized the need for purification procedures to minimize potential 1,4-dioxane impurities. PubChem currently indicates Hexamidine Diparaben does not meet GHS hazard criteria.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Hexamidine Diparaben is a valuable broad-spectrum antimicrobial and preservative, offering additional anti-inflammatory and barrier-supporting benefits, though its paraben classification and potential for sensitization require careful formulation.
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References
Sources