Arginine/Lysine Polypeptide
Skin conditioning and moisturizing peptide
About Arginine/Lysine Polypeptide
Arginine/Lysine Polypeptide is a synthetic biomimetic peptide built from two essential amino acids: arginine and lysine. In K-beauty formulations, this peptide functions primarily as a skin conditioning agent and humectant, helping to draw moisture into the skin while supporting the structural integrity of the skin barrier. Unlike single amino acids, this polypeptide chain delivers enhanced penetration and stability, making it particularly valuable in serums, ampoules, and treatment products. Korean brands have embraced this ingredient for its dual action: it not only hydrates superficially but also communicates with skin cells to support natural moisture retention mechanisms. Found in 22 products on Seoul Sister, it appears in highly rated formulations like the Lemon Vita Bubble Serum by Fully (5.0/5) and Numbuzin's No. 9 NAD PDRN Glow Treatment Toner (4.8/5), where it works synergistically with other actives to boost skin hydration and resilience. The ingredient's non-comedogenic rating of 0/5 makes it suitable across all skin types, while its strong safety profile (4/5) reflects its gentle nature and compatibility with sensitive skin. K-beauty chemists favor this peptide for its ability to enhance product texture and skin feel without causing irritation or clogging pores, making it a versatile supporting player in multi-step routines focused on hydration and barrier repair.
How Arginine/Lysine Polypeptide Works
At the molecular level, Arginine/Lysine Polypeptide functions through a combination of humectant activity and cellular signaling. The arginine component carries a positively charged side chain that attracts water molecules and helps regulate pH at the skin surface, creating an optimal environment for barrier function. Lysine contributes to collagen cross-linking and provides antimicrobial peptide properties that support skin health. When applied topically, this polypeptide penetrates the upper layers of the stratum corneum, where it binds water molecules and increases transepidermal water content. The peptide structure also mimics fragments of natural skin proteins, potentially triggering fibroblast activity and supporting the synthesis of structural proteins like collagen and elastin. Additionally, arginine's role as a precursor to nitric oxide may improve microcirculation at the skin surface, enhancing nutrient delivery. The synergy between these two amino acids creates a conditioning effect that goes beyond simple moisturization, actually helping skin cells maintain their own hydration systems more effectively over time.
Arginine/Lysine Polypeptide by Skin Type
Oily Skin
Arginine/Lysine Polypeptide works exceptionally well for oily skin due to its 0/5 comedogenic rating and lightweight hydrating properties. Instead of adding heavy oils or occlusives, this peptide delivers water-binding benefits that won't congest pores or increase surface oil production. The arginine component may also help regulate sebum quality by supporting healthy pH levels.
Dry Skin
This peptide is highly beneficial for dry skin, functioning as both an immediate humectant and a long-term barrier supporter. It draws moisture into dehydrated skin layers while potentially stimulating the production of natural moisturizing factors. Products like the Lemon Vita Bubble Pack Cleanser (4.9/5) use this ingredient to prevent the stripping effect common in cleansers for dry skin types.
Combo Skin
Combination skin benefits from this peptide's balanced approach to hydration without adding oil or weight. It can hydrate dry cheek areas while remaining lightweight enough not to overwhelm oilier zones. The non-comedogenic nature means it won't trigger breakouts in the T-zone while addressing dehydration elsewhere on the face.
Sensitive Skin
With a strong safety rating of 4/5 and gentle amino acid composition, this peptide is well-suited for sensitive skin. It provides soothing hydration without common irritants, and the lysine component may offer mild antimicrobial benefits that help protect compromised barriers. Products like CNP's Derma+ Answer Pink Toning Deep In Shot Ampoule (4.8/5) pair it with calming actives for reactive skin.
Normal Skin
Normal skin can use Arginine/Lysine Polypeptide as a preventative hydrating agent that maintains optimal moisture balance. It supports the skin's existing barrier function without overloading it, making it ideal for maintenance routines. The peptide enhances product absorption and skin texture without introducing unnecessary complexity.
How to Use Arginine/Lysine Polypeptide
- 1Layer this peptide in the essence or serum step of your routine, after toners but before heavier creams, to maximize its water-binding effects and allow deeper penetration.
- 2Pair with hyaluronic acid or other humectants for amplified hydration, as the peptide works synergistically with other water-attracting ingredients.
- 3Use products containing this peptide both morning and night, as its gentle profile and non-photosensitizing nature make it safe for daytime use under sunscreen.
- 4Allow 30-60 seconds after application for the peptide to absorb before applying subsequent layers, ensuring optimal cellular uptake and preventing pilling.
Background
Arginine and lysine have been used individually in cosmetics for decades, but their combination as a polypeptide represents a more recent advance in peptide technology from the early 2000s. Korean skincare researchers have been particularly innovative in incorporating amino acid-based peptides into hydration-focused formulations, recognizing that these building blocks of proteins could do more than just moisturize. The ingredient gained traction in K-beauty as the industry moved toward biomimetic skincare, products designed to work with the skin's natural biology rather than against it. Traditional Korean skincare emphasized nourishment through fermented ingredients rich in amino acids, and modern peptide technology like Arginine/Lysine Polypeptide represents a scientific evolution of this principle. Its appearance in high-performing products across multiple K-beauty brands reflects the industry's commitment to evidence-based hydration and barrier support.
K-Beauty Products with Arginine/Lysine Polypeptide
View all 22 →
Lemon Vita Bubble Serum
Fully
Lemon Vita Bubble Pack Cleanser
Fully
No. 9 NAD PDRN Glow Treatment Toner
Numbuzin
Derma+ Answer Pink Toning Deep In Shot Ampoule
CNP
Derma+ Answer Pink Toning Deep-In Shot Ampoule
CNP
No. 9 NAD RetinA Volume Shot Eye Cream
Numbuzin
Derma+ Answer Barrier Reset Cream
CNP Laboratory
Derma+ Answer Barrier Reset Cream
CNP
Vita Double Toning Cream
Rovectin
Retinosine Deep Intense Cream
Rovectin
Derma Answer Barrier Reset Cream Double Pack
CNP
Retinosine Deep Intense Serum
Rovectin
Frequently Asked Questions
Can I use Arginine/Lysine Polypeptide with vitamin C or acids?▼
How long does it take to see results from products with this peptide?▼
Is this peptide safe during pregnancy or breastfeeding?▼
Why is this peptide in cleansers if it's water-soluble?▼
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