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COSRX

6 Peptide Skin Booster Serum.

COSRX 6 Peptide Skin Booster Serum
Serums

About this product

A peptide-rich booster serum from COSRX formulated with six peptides to support hydration and the look of firmer, healthier skin.

Best for

Mature skin
Serums

The Guru Index verdict

88%

Approved

Approved · 88%
Guru Certified
Broad expert consensus
7Reviewers
7Approved
0Mixed
0Skip

What the gurus are saying

Gurus overwhelmingly praise this as an affordable, versatile peptide booster with a silky, water-like texture that layers seamlessly under other products. The consistent highlight is its multitasking formula addressing hydration, firmness, brightness, and sensitivity in one step. The main caveat is that it functions as an essence-like booster rather than a concentrated active, so results are best paired with complementary ingredients like retinoids; one reviewer cautioned it may disappoint as a standalone treatment but excels as a routine enhancer.
Synthesized from 7 expert reviews

Key actives & flags

NiacinamideHyaluronic acidVitamin EPeptidesFragrance-freeAlcohol-free

Full ingredients

Water, Dipropylene Glycol, Glycerin, Pentylene Glycol, 1,2-Hexanediol, Niacinamide, Acetyl Hexapeptide-8, Copper Tripeptide-1, SH-Polypeptide-121, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Oligopeptide-68, Palmitoyl Tripeptide-8, Allantoin, Sodium Hyaluronate, Acetyl Glucosamine, Serine, Alanine, Glycine, Threonine, Arginine, Proline, Betaine, Sodium PCA, Sodium Lactate, Pca, Glutamic Acid, Lysine Hcl, Tocopherol, Dextran, Glycine Soja (Soybean) Oil, Hydrogenated Lecithin, Ammonium Acryloyldimethyltaurate/​VP Copolymer, Polyacrylate Crosspolymer-6, Butylene Glycol, Xanthan Gum, Ethylhexylglycerin, Adenosine, Polyquaternium-51, Disodium EDTA, Citric Acid

Every take, in full

What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Approved only Skip only Mixed only Hide sponsored
Approved
"I am loving this, you guys. This is the COSRX 6 Peptide Skin Booster Serum. It literally is like water. So when you put this on, you can spread this on your entire body for a fraction of what you would pay for like some of the other types of creams. This is not expensive. I believe this is under $20. It has six different peptides in it, hyaluronic acid, amino acids. Even skin tones, hydrating, firmness, and smooth pore and sebum care, improve skin texture. I've noticed all of that. A peptide pairs very well with a retinoid, so this is great to put on first and then add a retinoid."
All 3 takes from Darnell Cox | 50+ Healthy Aging Expert
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"I am loving this, you guys. This is the COSRX 6 Peptide Skin Booster Serum. It literally is like water. So when you put this on, you can spread this on your entire body for a fraction of what you would pay for like some of the other types of creams. This is not expensive. I believe this is under $20. It has six different peptides in it, hyaluronic acid, amino acids. Even skin tones, hydrating, firmness, and smooth pore and sebum care, improve skin texture. I've noticed all of that. A peptide pairs very well with a retinoid, so this is great to put on first and then add a retinoid."
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"I am loving this, you guys. This is the COSRX 6 Peptide Skin Booster Serum. It literally is like water. So when you put this on, you can spread this on your entire body for a fraction of what you would pay for like some of the other types of creams. This is not expensive. I believe this is under $20. It has six different peptides in it, hyaluronic acid, amino acids. Even skin tones, hydrating, firmness, and smooth pore and sebum care, improve skin texture. I've noticed all of that. A peptide pairs very well with a retinoid, so this is great to put on first and then add a retinoid."
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"This is a six peptide skin booster. It's by Cos Rx. You can get it at Costco... It's great. It's great."
Approved
"The COSRX 6 Peptide Skin Booster is one of my favorites. You get a lot of product with this, which is what I love. Super inexpensive, and that's key. The COSRX one has six different peptides in each one delivering a different benefit."
All 4 takes from Mad About Skin
Top 10 KOREAN SKINCARE FAVOURITES - K-Beauty You Have To Try (*UNSPONSORED*)
"I found this to be a great great option um so with this one you got six amazing different peptides in here to plump the skin to hydrate it's going to minimize fine LS and wrinkles"
Its Official - PEPTIDE SERUMS JUST CHANGED FOREVER (Peptide Flooding)
"The COSRX 6 Peptide Skin Booster is one of my favorites. You get a lot of product with this, which is what I love. Super inexpensive, and that's key. The COSRX one has six different peptides in each one delivering a different benefit."
NEXT LEVEL PEPTIDE SERUMS - Ultimate Botox In A Bottle Anti Aging
"This peptide product is so beautiful, so lightweight, not sticky, not tacky, just glides onto the skin. While it hasn't got that hit of copper peptide in here, it has got a plethora of other peptides for just so many different benefits. I love that one. When COSRX does it right, they do it really right, and that for me is an absolute hero product."
NEXT LEVEL PEPTIDE SERUMS - Ultimate Botox In A Bottle Anti Aging
"It's beautiful, so lightweight, not sticky, not tacky, just glides onto the skin. It hasn't got that hit of copper peptide in here, but it has got a plethora of other peptides for just so many different benefits. I love that one, and yeah, COSRX when they do it right they do it really right, and that for me is an absolute hero product."
Approved
"The six peptide skin booster serum is my favorite in this category. I think the concept is derived from the popular injectable skin boosters that are super popular in Korea but in a topical form, and I think that means making the skin more hydrated and more radiant at the end of the day, and I think the formula really does that. It's a wonderful formula because it has peptides and I love peptides. It's a multitasking serum that has six different peptides as the name implies that really helps to promote and improve skin elasticity, texture, radiance, and tone and overall skin vitality. Really designed for those who are seeking a lightweight, almost like an essence, a non-sticky essence or serum that really helps to address all of those concerns in one. The six peptide complex targets fine lines, improves radiance, improves tone, helps to improve skin hydration along with niacinamide, which is a jack of all trades that does a little bit of everything for better skin, and then glycerin that helps to hydrate. All of these ingredients really help target fine lines, skin hydration, support skin barrier, brighten the skin and make your skin look so much better."
Top Pick: peptide serum
Approved
"The COSRX 6 Peptide Skin Booster is a peptide serum that's very hydrating. It has acetyl glucosamine, which is great for moisture balance, amino acids, and a variety of peptides which may help to a certain extent in helping your skin with its collagen production needs, but at any rate seems to be helpful for improving moisture content. I really like actually using this serum as the first step in a skincare routine after cleansing. It does have niacinamide, which is great for redness, hyperpigmentation, and the moisture barrier, but some of you are sensitive, so if you're sensitive, skip the peptide serum."
Approved
"The six peptide skin booster from COSRX has tons of complimentary benefits: boosting, plumping, fine line, firmness, oil control, pores, reduce skin sensitivity, retexturize blemishes and brightening, and all of that is true. I think this is the best multi-purpose product because COSRX is very cost-effective. The aesthetics of this product feel so good. Peptides as a group are easily the number one supporting ingredient, providing the best broad benefits. When it comes to Korean skincare brands and COSRX in general, you really just cannot beat the texture, the way that it will layer under any other product or layer under your makeup or layer underneath your sunscreen. They always bring hydration, they always bring calming and soothing, and peptides truly play well with pretty much any other ingredient. This does really so much, especially with the copper peptides and especially with the organ that's in this formula."
Approved
"Cosrx 6 Peptide Skin Booster Serum is a really compelling mix of peptides and a great skin booster. It's a great booster if you're really feeling like there's something missing in your routine. The benefits that these peptides provide include some collagen stimulation, some firming, brightening, and some skin soothing and reducing of redness. The texture alone is going to work for a majority of skin types because it's been designed to be used in a multi-layered skincare routine and to work alongside other products to really help enhance those types of benefits. The hydration on here is so good, and for being a thinner texture it really does surprise me how good this feels on the skin. I think this is a product that if you're just starting out in your skincare routine and haven't quite figured everything out yet, this will impress you."
All 4 takes from Kelly Driscoll
Cosrx The 6 Peptide Skin Booster Serum, Reviewed!
"Is it the best overall Superstar anti-aging product that you can add into your routine absolutely not is this a great co-star an additional product a booster that you can add alongside of a nice fully developed skincare routine to boost your results maybe"
This or That? Cosrx The 6 Peptide Vs Jumiso Snail + Peptide | ep 31
"Cerx is calling itself a serum booster, the key word there is booster. This is something that helps lift up the rest of your routine, but on its own, if it was your only active product, you know, active meaning the peptides in this, I think you might be disappointed with it. I personally was when I tested this out. I didn't feel that I got a ton of benefits from it on its own. I think that it works well as a booster, but it's important to know this isn't a highly concentrated serum. This is an essence. Cerx is using some more interesting peptides and the mix delivers a more unique set of benefits. There are some collagen stimulating peptides in here, but it's not a heavy focus of the six peptide mix that they're using. They're also looking to address signs of sensitivity and irritation on the skin, redness and inflammation, which can be particularly helpful if you do have a sensitive skin type or if you're struggling with your moisture barrier. It can also be helpful if you do struggle with inflammatory acne. There's also a brightening peptide in here that can help with the overall complexion and clarity of the skin and the evenness of it."
This or That? Cosrx The 6 Peptide Vs Jumiso Snail + Peptide | ep 31
"Cosrx 6 Peptide Skin Booster Serum is a really compelling mix of peptides and a great skin booster. It's a great booster if you're really feeling like there's something missing in your routine. The benefits that these peptides provide include some collagen stimulation, some firming, brightening, and some skin soothing and reducing of redness. The texture alone is going to work for a majority of skin types because it's been designed to be used in a multi-layered skincare routine and to work alongside other products to really help enhance those types of benefits. The hydration on here is so good, and for being a thinner texture it really does surprise me how good this feels on the skin. I think this is a product that if you're just starting out in your skincare routine and haven't quite figured everything out yet, this will impress you."
This or That? Cosrx The 6 Peptide Vs Jumiso Snail + Peptide | ep 31
"From the texture alone it's going to work for a majority of skin types because it's been designed to be used in a multi-layered skincare routine. The hydration on here is so good. For being a thinner texture, it really does surprise me how good this feels on the skin. If you're just starting out in your skincare routine and haven't quite figured everything out yet, I think this will impress you and show benefits on your skin. If you haven't gone that far in your routine yet and you need a boost and you're thinking peptides might be the way to go, plus you're interested in trying different peptides than the same old ones that are in every product, the Cosrx 6 Peptide Skin Booster Serum is the correct choice for you. If you like the idea of adding some extra peptides into the mix and you're okay with it feeling like an addition, just some extra peptide sprinkled in on top, then this would work. It's not a super concentrated peptide product, though, so as long as you know that."
Approved
"It's really nice but it's very watery so one and a half pumps is usually enough to cover everything really easily and quickly and absorbs almost instantly."
All 5 takes from No BS Beauty
COSRX Skincare 🆕 The 6 Peptide Skin Booster Serum First Impressions Review & Demo
"It feels more like an essence or an ampoule with the texture, but it feels nice and light and it does not have any smell to it at all. It has a lot of peptides in it. The formula has a six peptide complex that provides various skin benefits like collagen boosting and brightening. It's perfect as a first step serum that pairs well with other active ingredients. The exciting ingredients in here are arginine, which does have some really good studies showing that it helps decrease wrinkle depth by 17 percent after used for 15 days and a decrease after 28 days of further decrease in wrinkle depth of 16 percent. It's pretty high up the ingredient list. Copper peptides are in here as well."
COSRX Skincare 🆕 The 6 Peptide Skin Booster Serum First Impressions Review & Demo
"The ingredients in here are great and it's fragrance free as well and much more affordable but still got lots of good peptides in here. It's got niacinamide, all those peptides and amino acids, and it feels really nice on my skin, like really nice. So we've got all those cell communicating ingredients, skin brightening with the niacinamide and acetoglucosamine, then we've got those amino acids and then for soothing copper peptide and some vitamin E in there and soybean oil. If you have acne prone skin the main ingredients to be aware of is the vitamin E and the soybean oil, those are the only ingredients of note. So really nothing to be concerned about for the most part, most people tolerate vitamin E very well even though it's kind of comedogenic, it just sometimes depends on the formula too. Overall it feels nice, I'm really impressed. I'm going to continue to use this because I really like it."
COSRX Skincare 🆕 The 6 Peptide Skin Booster Serum First Impressions Review & Demo
"It's got some vitamin E in there and soybean oil, so if you have acne prone skin, the main ingredients to be aware of is the vitamin E and the soybean oil. Most people tolerate vitamin E very well even though it's kind of comedogenic, it just sometimes depends on the formula too. Overall it stuff feels nice. I'm really impressed. I'm going to continue to use this because I really like it. The copper peptide in there is very sensitive to other ingredients. I have found copper peptides are very fussy. You're not supposed to use them with almost anything else basically. I mean not supposed to use their retinol, acids, vitamin C, or strong antioxidants. So basically almost anything you use. But I found if I use a copper peptide and then layer a neutral product in between that's not a pH dependent product, that's not an active in between the copper peptide, it seems to work for me and other brands have recommended it, because otherwise you have to choose one or the other. Copper peptides can be very fragile. It's still kind of a relatively newer ingredient in skin care, but I found that works for me and I'd rather do both as long as your skin isn't irritated than have to pick one or the other and only get the benefits from one or the other."
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"Next up from COSRX is their 6 Peptide Skin Booster, which is their newer release. It's a wonderful liquid booster it retails for 21. I kind of use it in place of an essence and it's really absolutely wonderful. I can't wait to do a full review of this one after I've gotten a little bit more chance to test it out. So far so good, so so good."
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"It's really nice but it's very watery so one and a half pumps is usually enough to cover everything really easily and quickly and absorbs almost instantly."
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