Histidine Hcl
INCI: HISTIDINE HCL
Reviewed by Rosie · Last updated 14 Aug 2026
An amino acid that conditions skin and hair through natural moisture support
Best For Skin Types
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Usage Frequency
Daily
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What Is Histidine Hcl?
Histidine HCl is the hydrochloride salt form of histidine, a semi-essential amino acid found naturally in the body. In cosmetics, it is typically produced through fermentation and functions as both a skin and hair conditioning agent.
As an amino acid, histidine plays a role in maintaining the skin's natural moisture balance and supporting the structural integrity of skin proteins. It is used in relatively small quantities across skincare formulations.
How It Works
Histidine functions as part of the skin's natural moisturising factor—a complex of compounds that helps the outer layer of skin attract and hold water. As an amino acid, it can be incorporated into or support the formation of proteins that maintain skin firmness and elasticity.
The ingredient also has mild buffering properties due to its salt form, which may help maintain skin pH balance in formulations.
Clinical Evidence & References
Evidence for histidine's efficacy in skincare is limited. Most available research focuses on histidine's role as a nutritional additive in animal feed rather than topical cosmetic use, which limits direct conclusions about skin benefits in this context.
Histidine is generally recognised as safe in cosmetic applications based on its natural presence in the body and established safety data, though specific clinical studies demonstrating measurable skin improvements from topical application are sparse.
Published Research
How to Use
Histidine HCl is typically found in formulations at very low concentrations (often below 1%) as a supporting ingredient rather than a primary active. It works best as part of a broader moisturising or conditioning formulation rather than relied upon alone for significant results.
Safety & Precautions
Frequently Asked Questions
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