COSRX The 6 Peptide Skin Booster Serum
By Nur → Last verified 9/30/2026
Price checked 9/30/2026
Price-checked 2026-09-30.
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What we found
Based on how this product compares to others in the serums category, cross-referenced against retailer listings and market data.
Strengths
- + Confirmed fragrance-free
- + Sustained demand in the Korean market
Worth knowing
- - The six specific peptides aren't individually cross-checked against our general-ingredient reference -- only the surrounding formula actives are
Key ingredients
These are the ingredients COSRX highlights for this product, cross-checked against general dermatological and cosmetic-chemistry sources, not a full INCI list.
Fragrance: confirmed fragrance-free.
| Ingredient | What it is | What it does for skin |
|---|---|---|
| Niacinamide | A form of vitamin B3, one of the most studied ingredients in cosmetic dermatology. | Strengthens the skin barrier by boosting ceramide production, helps even out tone by limiting pigment transfer to skin cells, and can reduce the look of enlarged pores. |
| Adenosine | A compound naturally present in skin cells, used in skincare as an anti-aging active. | Recognized by South Korea's MFDS as a functional anti-wrinkle ingredient at 0.04% concentration, based on clinical studies showing measurable fine-line improvement; a real but modest effect, not a retinoid substitute. |
| Betaine | An amino-acid-derived humectant, naturally found in sugar beets and also present in snail mucin. | Helps draw and hold moisture in the skin, and has mild soothing properties. |
| Allantoin | A soothing compound, naturally occurring in some plants and also made synthetically. | Calms irritation and supports skin healing, often paired with other barrier-focused ingredients. |
| Sodium hyaluronate | The salt form of hyaluronic acid, commonly used for its water solubility and stability in formulas; molecular weight varies by product rather than being uniformly smaller. | Draws and holds moisture the same way hyaluronic acid does; how easily it absorbs depends on the specific molecular weight used, which formulas don't always disclose. |
| Arginine | An amino acid used in skincare as a humectant and skin-conditioning ingredient. | Helps draw and retain moisture, and is part of the skin's natural moisturizing factor. |
| Tocopherol | The chemical name for vitamin E as typically used in skincare formulas. | Helps neutralize free radicals from UV and pollution exposure and supports the skin's moisture barrier. |
What the brand says
COSRX's own marketing claims, not our own findings.
- A lightweight, first-step serum that helps bring skin back into balance. This water-like formula is infused with six targeted peptides that work together to smooth fine lines, minimize the look of pores, and improve texture and tone
Research-Based
Our assessment comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. This product hasn't been hands-on tested yet. See our Methodology for what that distinction means.
Price history
Current price is the lowest we've recorded so far.
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Frequently asked
How much does COSRX The 6 Peptide Skin Booster Serum cost per mL?
$0.14 per mL (currently $21.00 for 150 mL).
Has COSRX The 6 Peptide Skin Booster Serum been hands-on tested?
Not yet. Our assessment for this product comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. See our Methodology for what that distinction means.
What are the key ingredients in COSRX The 6 Peptide Skin Booster Serum?
The ingredients COSRX highlights for this product include Niacinamide, Adenosine, Betaine, Allantoin, Sodium hyaluronate, Arginine, Tocopherol.
Sources
Pricing and availability for this product were verified against the following retailer listings.