This lightweight, toner-like serum blends six powerful peptides to address fine lines, uneven texture, and loss of firmness. Suitable for all skin types, it absorbs instantly to boost elasticity, refine the appearance of pores, and leave skin smoother and stronger with every use.
Size: 150mL (5.07 fl.oz)
| Concern | Suitable | Key Benefit | Key Ingredient |
|---|---|---|---|
| Fine lines & wrinkles | Yes | Firms and improves elasticity | 6 Peptide Complex |
| Loss of radiance | Yes | Boosts glow & vitality | Niacinamide |
| Uneven tone | Yes | Brightens and refines skin | Hyaluronic Acid, Peptides |
| Sagging skin | Yes | Visibly lifts and tightens | Peptide Blend, Adenosine | Rough texture | Yes | Smooths and refines surface | Panthenol, Peptides |
| Info | Details |
|---|---|
| Volume | 150mL |
| Key Ingredients | 6 multi-peptides with different effects, Hyaluronic Acid, N-Acetylglucosamine, Allantoin |
| Clinically Proven | Yes (Primary Skin Irritation Tested, Sensitive Skin Irritation Tested, Non-Comedogenic Tested on Acne-Prone Skin) |
| Expiration | 36 months from manufacturing or 12 months after opening |
| Allergens | Hypoallergenic tested |
| Feature | 6 Peptide Skin Booster | Typical Serum |
|---|---|---|
| Multi-peptide actives | 6 potent peptides for pores, sebum, firmness, tone, texture | Often 1–2 peptides or generic actives |
| Target concerns addressed | Pores/sebum, fine lines, texture, tone, soothing, hydration | Addresses only one concern |
| Texture | Lightweight, non-sticky, toner-type feel | Heavier or residue-leaving |
| Skin types | Suitable for all skin types, especially those with complex skin concerns | Caters to narrower skin types |
Clinically proven through independent skin science testing by the Dermacosmetic Skin Science Laboratory Co., Ltd for visible hydration and firmness results.
Clinically proven to deliver youthful, hydrated, and radiant skin.
increase in deep moisture
improvement in skin texture
boost in skin clarity
increase in radiance
improvement in density
Based on clinical trials of 20 subjects.As a result of the clinical trials from Dermacosmetic Skin Science Laboratory Co., Ltd (Sep 18 ~ Oct 31, 2023)
Perfect for anyone who wants one product to do it all, this serum targets firmness, pores, fine lines, dullness, hydration, radiance and uneven tone in a single step.
Formulated through non-comedogenic and primary irritation tests, it’s gentle enough for sensitive, acne-prone, or reactive skin types.
Designed for people looking to prevent early signs of aging while keeping the skin smooth, hydrated, and radiant.
Designed for easy layering, enhancing the affects of subsequent serums and ampoules when used before them.
Limited-Time Offer
COSRX The 6 Peptide Skin Booster Serum works as the first step after cleansing to prep and awaken the skin. Its six multi-peptides, hyaluronic acid, and amino acids help improve texture, firmness, and hydration. It enhances the effects of subsequent products, making it an ideal all-in-one base for any skincare routine.
Visible improvements are typically observed after four weeks of consistent use. In clinical testing, 100% of participants reported smoother and more supple skin, with measured increases in hydration (+162.5%), texture (+76.4%), and clarity (+40.1%). Many users notice enhanced glow and softness within the first week of daily application.
Yes, the formula is designed for compatibility with other active ingredients. It layers well with Vitamin C, Retinol, Niacinamide, Ceramide, and Snail Mucin products to boost hydration, firmness, and radiance. Its low-irritation formula makes it safe for daily use, even in routines that include exfoliating acids or retinoids.
This peptide serum is a versatile starter that helps refine skin texture and boost overall skin health. Formulated with six carefully selected peptides, it supports hydration, brightness, density, radiance, clarity, and smoothness, working well with any next-step product.
Yes. Clinical studies from the Dermacosmetic Skin Science Laboratory confirm that the serum is safe for sensitive skin and suitable for acne-prone conditions. It is non-comedogenic and clinically proven, meaning it won’t clog pores or cause irritation, even with continuous use.
Apply the 6 Peptide Skin Booster Serum immediately after cleansing, as a toner before essence and thicker ampoule/serum. It acts as a hydration and prep step, enhancing the performance of following treatments like serums, ampoules, or creams. Use twice daily for optimal firmness, glow, and slow-aging benefits.
This serum is suitable for all skin types, including sensitive and acne-prone skin. It has been clinically tested for non-irritation and non-comedogenic properties, ensuring that it does not clog pores. It is ideal for those seeking a single first-step product that enhances firmness, smoothness, and glow while maintaining a healthy skin barrier.
Overall rating: 4.699637 / 5 from 15974 reviews.
Customers love the D_The 6 Peptide Skin Booster Serum for its smooth, silky texture and hydrating effects. The serum is praised for its effective ingredients and noticeable results in improving skin firmness and elasticity. Suitable for all skin types, it absorbs quickly and leaves skin feeling plump and healthier.
Review topics: ["feels","texture","improvement","use","skin","glow","looks","difference","serum","women","skincare","brand"].
"The COSRX The 6 Peptide Skin Booster Serum is a very lightweight, watery serum that absorbs quickly and layers well with other skincare products. It mainly focuses on hydration and improving skin texture, making the skin feel softer, smoother, and slightly plumper over time."
"This is a perfect serum that penetrates your skin quickly so you can layer with additional items. The ingredients are exactly what I am looking for in a peptide serum."
"Has a really lightweight, almost watery texture that absorbs quickly and doesn’t leave any sticky feeling behind. Most importantly, it didn’t irritate my skin or cause any breakouts. After using it consistently my skin is starting to feel smoother. It has not been an overnight transformation, but I have noticed that my skin is looking healthier and more even as time goes on. It also layers really well with the rest of my skincare, which I appreciate. If you have sensitive skin this is a solid option. It’s gentle, effective, and easy to incorporate into your routine."
"I’ve been using the COSRX The 6 Peptide skin booster for a few weeks now and I’m really happy with the results. My skin feels smoother, and I’ve noticed that my fine lines and pores look more refined"
"Love this product! My second of many more purchases to come. It helps even out my skin tone and provides just the right amount of moisture to keep my combination skin hydrated but not oily. Hope they add some more anti-acne ingredients in the future though, as my chin congestion hasn't changed and I've been using the product for 6 months now."
"I love this product on my face, neck & chest. My skin looks so much healthier, less redness."
"Just got this use in the am. Not sticky and barely noticeable. Use in the am before makeup. Will need longer to see if it’s making a difference. I do wish I had cosRX as a teen it would have helped."
"This Peptide Booster is a staple in my daily skin routine. It beats others hands down and I will never change this product brand. They dont skimp on product volume or ingredients. There is so much in the bottle that along with using on my face, neck and chest I also use it on my arms. If you are a peptide fan, and you should be if not, this product wont disappoint, I promise"
"Amazing! I have been using this in combination with the Snail 92 all in one cream. I live in a dry climate so it helps keep my skin moisturized without feeling greasy."
"I’ve been using the COSRX The 6 Peptide Skin Booster Serum since November 2025, and I have dry skin. The texture is very lightweight, honestly more like a toner than a typical serum. It absorbs quickly and doesn’t leave any sticky or heavy feeling, which I really like, especially for layering. Since using it, my skin feels more hydrated and overall clearer. It’s not a dramatic, overnight difference, but my skin just looks healthier and more balanced over time. I use it both morning and night right after cleansing, and it fits easily into my routine without causing any irritation. If you have dry skin and don’t like thick or heavy products, this is a really nice option. It adds hydration without feeling like it’s sitting on your skin. I would repurchase this again. It’s a good, simple product that supports your skin rather than trying to do too much at once."
