Science
Mechanism of Action
As a key building block of the skin protein filaggrin, Histidine HCl contributes to the formation of Natural Moisturizing Factors (NMFs) upon proteolysis, thereby enhancing the skin's ability to retain moisture and strengthen its barrier function. It acts as a powerful antioxidant by actively scavenging hydroxyl radicals, which protects skin cells from free radical damage and oxidative stress. Furthermore, Histidine HCl stimulates enzymes essential for collagen synthesis, aiding in the reduction of fine lines, and possesses soothing properties that can alleviate irritation. It also helps maintain an optimal skin pH level and serves as a precursor to urocanic acid, offering a degree of protection against UV-induced damage.
Research
Clinical Evidence
Medium confidenceN/A
Transparency
Dusting Analysis
No data suggests Histidine HCl is commonly 'dusted' at concentrations without functional benefit, nor is there information on dusting thresholds or red flag percentages.
The Formula
Formulation
Stability
Optimal stability for L-Histidine Monohydrochloride Monohydrate is within a pH range of 3.0 to 4.5. High concentrations of histidine in liquid formulations have been observed to lead to coloration and significant aggregation when exposed to stainless steel containers at elevated temperatures (40°C) during bulk freezing-thawing processes.
Conflicts
- High concentrations with stainless steel containers at elevated temperatures (leading to coloration and aggregation)
Safety
Safety Profile
The CIR Expert Panel has deemed amino acids and their simple salts, including Histidine HCl, safe for cosmetic use at typical concentrations, citing them as non-irritating. The FDA recognizes amino acids, including their hydrochloride salts, as Generally Recognized As Safe (GRAS) food additives. While no specific SCCS opinion was found for Histidine HCl, amino acids are permissible in cosmetics in Europe under general provisions. EWG Skin Deep rates Histidine HCl with 'LOW' concern across categories including cancer, allergies & immunotoxicity, and developmental and reproductive toxicity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Histidine HCl is a valuable skin-identical amino acid offering significant antioxidant protection, crucial hydration through NMF support, and barrier strengthening properties, suitable for all skin types.
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