What makes COSRX The 6 Peptide Skin Booster Serum different from a regular serum?

COSRX The 6 Peptide Skin Booster Serum is designed as a first-step booster rather than a single-focus serum. Its 6 Peptide Complex works together with niacinamide, sodium hyaluronate, and N-acetylglucosamine to address multiple concerns at once, including firmness, enlarged pores, uneven texture, and dehydration. The toner-like texture sinks in quickly without stickiness, prepping the skin so that any serums or ampoules applied afterward can absorb more effectively. It fits seamlessly into a K-beauty routine as the foundation for glass skin and slow-aging care.

Is COSRX The 6 Peptide Skin Booster Serum suitable for sensitive or acne-prone skin?

Yes. COSRX The 6 Peptide Skin Booster Serum has been non-comedogenic and sensitive skin irritation tested, meaning it is formulated not to clog pores and to be gentle on easily irritated skin. The inclusion of hydrating sodium hyaluronate and soothing allantoin helps maintain barrier comfort while peptides and niacinamide work on early-aging and pore concerns. As with any active-supporting product, those with highly reactive or compromised skin should patch test first and introduce the booster gradually into their Korean skincare routine.

What skin concerns does COSRX The 6 Peptide Skin Booster Serum help improve?

The 6 Peptide Skin Booster Serum is formulated to support multiple concerns at once: loss of firmness, early fine lines, enlarged pores, uneven texture, dehydration, and overall dullness. Clinical testing has shown significant improvements in deep moisture, texture, clarity, and brightness after 4 weeks of use. By combining a 6 Peptide Complex with niacinamide, N-acetylglucosamine, and hydrating agents, it helps the skin appear smoother, bouncier, and more radiant, contributing to a glass skin-inspired finish over time.

Can I use COSRX The 6 Peptide Skin Booster Serum with Vitamin C or Retinol?

Yes. COSRX The 6 Peptide Skin Booster Serum is formulated to be compatible with other active ingredients and can be used as a hydrating, peptide-rich base before applying vitamin C or retinol treatments. Apply the booster immediately after cleansing, allow it to absorb, then follow with targeted actives such as a brightening vitamin C serum or retinol product, and finish with moisturizer. Because it helps hydrate and soothe, it may also reduce the feeling of dryness that can accompany strong actives, but users with very sensitive skin should still introduce combinations slowly.

Does COSRX The 6 Peptide Skin Booster Serum help with glass skin and makeup application?

By significantly increasing deep moisture and improving texture and brightness, COSRX The 6 Peptide Skin Booster Serum helps create the smooth, hydrated base associated with K-beauty glass skin. The fast-absorbing, non-sticky finish makes it suitable for use under sunscreen and makeup, preventing foundation from clinging to dry patches or emphasizing roughness. With regular use, it supports a more even, plump-looking complexion so base products can sit more naturally on the skin and maintain a fresh, radiant appearance throughout the day.

COSRX The 6 Peptide Skin Booster Serum shown with text highlighting ‘First Step Booster’, clinically proven and non-comedogenic; clinically proven Korean peptide serum that boosts glow, firmness, and clarity for sensitive skin as the first step of skincare routine.

COSRX The 6 Peptide Skin Booster Serum clinical results after 4 weeks shown on pink background; 100% users reported softer, smoother, and healthier skin; peptide-rich first-step serum enhancing firmness, glow, and hydration for sensitive skin.

Clinically proven COSRX The 6 Peptide Skin Booster Serum performance chart showing +162.5% hydration, +76.42% texture, and +37.9% brightness improvement; K-beauty all-in-one serum tested for firmness, glow, and radiance under dermatological supervision.

Before-and-after clinical visuals showing 76.41% smoother skin texture and 22.22% increased density after 4 weeks of using COSRX The 6 Peptide Skin Booster Serum; peptide-enriched formula for firm, glowing, and resilient skin barrier.

COSRX The 6 Peptide Skin Booster Serum hydration and brightness results with before-and-after images; +162.5% hydration, +37.9% brightening, +40.1% clarity; first-step Korean serum clinically tested to restore glow and firmness in sensitive skin.

Clinical before-and-after images showing reduction in blackheads, whiteheads, and pigmentation after 4 weeks of COSRX The 6 Peptide Skin Booster Serum use; peptide and NAG formula improving sebum balance, clarity, and even tone.

COSRX The 6 Peptide Skin Booster Serum ingredients visual highlighting six peptide complexes, collagen-boosting, retexturizing, brightening, soothing, firming, and pore care; multifunctional Korean serum for smooth, glowing, and firm skin.

Ingredient synergy chart for COSRX The 6 Peptide Skin Booster Serum showing Niacinamide, N-Acetyl Glucosamine, Adenosine, and Hyaluronic Acid; scientifically formulated to improve elasticity, skin barrier, and hydration for all skin types.

COSRX The 6 Peptide Skin Booster Serum clinical report image showing non-comedogenic certification from Dermacosmetic Skin Science Laboratory Co., Ltd; proven suitable for acne-prone and sensitive skin without clogging pores.

Clinical report verifying COSRX The 6 Peptide Skin Booster Serum as suitable for sensitive skin; tested by Dermacosmetic Skin Science Laboratory Co., Ltd, June 2023; peptide formula proven non-irritating, safe as a first-step serum for firm, glowing, and balanced skin.

Illustrated skincare routine showing COSRX The 6 Peptide Skin Booster Serum as the second step after cleansing; Korean all-in-one peptide booster formulated with hyaluronic acid and amino acids to prep, firm, and awaken skin for glow and hydration.

Texture swatches of COSRX The 6 Peptide Skin Booster Serum showing lightweight, layerable formula that pairs with any active ingredient; designed to soothe irritation and enhance serum efficacy for sensitive skin barrier repair and glow.

40% off

COSRX animation explaining how the 6 Peptide Skin Booster Serum addresses collagen loss by targeting pores, dryness, dark spots, redness, uneven texture, and wrinkles. Hydration droplets absorb into skin as six peptides boost firmness, glow, and smoothness while supporting natural collagen and soothing sensitive skin.

Video showing the lightweight texture of COSRX’s 6 Peptide Skin Booster Serum absorbing quickly into the skin. The water-based formula leaves a smooth, hydrated surface, highlighting its gentle first-step suitability for sensitive skin and its role in boosting glow, firmness, and overall skin texture.

Video of a creator playfully tossing a pink prop while promoting COSRX’s 6 Peptide Skin Booster Serum. The playful motion and pastel visuals highlight the booster as a fun, easy first-step serum that enhances glow, firmness, hydration, and supports sensitive skin in a lightweight routine.

Brightening Boost

Unlock Your Brightest Glow

The Brightening Boost is your intensive, expert-engineered kit to achieve a visibly brightened, glowing, and smooth complexion. This powerful bundle pairs two best-selling formulas for maximum brightening impact with zero irritation.

Step 1: Texture & Glow Care
The 6 Peptide Skin Booster Serum (150mL / 5.07 fl.oz)
Step 2: Brightening Care
Advanced The Vitamin C 23 Serum (20ml / 0.67fl. oz)

Skin Booster

Size

150mL (5.07 fl.oz)

⏰This special set offer ends on 12/31 (PST)!

$30.00 $50.00

Recommended for
COSRX The 6 Petide Skin Booster is suitable for all skin types and can be used all day and in any season. It is especially ideal for those seeking a lightweight, non-sticky serum to enhance their original skincare routine. Additionally, it is perfect for individuals with complex skin concerns, including those who want to address multiple skin issues like pores, excess sebum, fine lines, and uneven skin texture and tone.

Target concerns
- Dullness
- Oily skin
- Dehydration
- Pores
- Anti-aging
- Redness & Sensitive skin

Texture
Light-weight and non-sticky like toner and easy to pair other active ingredients and textures.

After cleansing you may use this serum as the first step of skin care. Spread the serum on the entire face and you may apply several times to amplify the effect of the next serum or ampoule.

KEY INGREDIENTS

6 Peptides : Restores multiple skin concerns
• SH-Polypeptide-121: Collagen Boosting & Plumping
• Copper Tripeptide-1: Retexturize
• Dipeptide Diaminobutyroyl Benzylamide Diacetate: Excess Sebum & Pore Care
• Oligopeptide-68: Brightening
• Palmitoyl Tripeptide-8: Soothe & Reduce Skin Sensitivity
• Acetyl Hexapeptide-8: Smooth Fine Lines & Firmness

Target concerns
- Dullness
- Oily skin
- Dehydration
- Pores
- Anti-aging
- Redness & Sensitive skin

Texture
Light-weight and non-sticky like toner and easy to pair other active ingredients and textures.

After cleansing you may use this serum as the first step of skin care. Spread the serum on the entire face and you may apply several times to amplify the effect of the next serum or ampoule.

KEY INGREDIENTS