Lysine Hcl
INCI: LYSINE HCL
Reviewed by Rosie · Last updated 14 Aug 2026
Also known as: Lysine Hcl
An amino acid that supports skin hydration and structural integrity
Best For Skin Types
All, Dry, Mature
Addresses
Usage Frequency
Daily
Lysine Hcl products at Skintique
View all →
What Is Lysine Hcl?
Lysine HCl is the hydrochloride salt form of lysine, an essential amino acid. In skincare, it functions as a humectant and skin conditioning agent, helping to draw moisture into the skin and support its natural hydration processes.
Lysine plays a structural role in the body's connective tissues, including collagen and elastin. When used topically, it may help maintain skin firmness and support the skin barrier, though its effects are primarily hydrating rather than transformative.
Benefits for Your Skin
How It Works
Lysine is a hygroscopic ingredient, meaning it attracts and holds water molecules. When applied topically, it draws moisture into the skin's upper layers, improving hydration and skin feel.
As an amino acid, lysine is also a building block for proteins like collagen and elastin. Whilst topical application cannot directly synthesise new collagen, maintaining adequate amino acid presence in the skin environment may support the skin's natural maintenance of these structures.
Clinical Evidence & References
Research into lactate metabolism in skin suggests that certain amino acid and metabolite pathways can influence fibroblast activity and collagen expression. However, most evidence focuses on systemic or injectable forms of amino acids or related compounds, rather than topical lysine HCl application.
Direct clinical evidence for topical lysine HCl in cosmetic formulations remains limited. It is primarily used for its hydrating and conditioning properties rather than as a targeted anti-ageing or therapeutic agent. More research would help establish its specific efficacy in skincare products at typical use concentrations.
Published Research
How to Use
Lysine HCl is typically found in moisturisers, serums, and hair care products at low concentrations (usually under 1%). It is best used as part of a consistent hydration routine, either daily or as needed depending on your skin's moisture levels. Combine with other hydrating ingredients such as glycerol or humectants for cumulative effect.
Safety & Precautions
Frequently Asked Questions
From the Clinic
Not sure what your skin actually needs?
Two minutes, a few questions, and we’ll point you at what matters — no guesswork.
Take the skin quizRelated Ingredients
Lycium Chinense Stem Extract
A plant extract known for gentle skin conditioning and antioxidant support
Lycoris Aurea Extract
A plant extract known for its skin conditioning and protective properties
Lysine Carboxymethyl Cysteinate
A glutathione precursor that strengthens skin's antioxidant defences against environmental stress
Lysophosphatidic Acid
A naturally occurring phospholipid that supports skin and hair conditioning
Lysophosphatidylethanolamine
A phospholipid that supports skin conditioning and cellular membrane function
Lysozyme
A naturally occurring protein with skin conditioning properties
Learn More About Skincare Ingredients
Explore our comprehensive ingredient glossary to understand what's in your products.
Browse All IngredientsShop Our Products
Find professional skincare solutions at Skintique.