What is COSRX 6 Peptide Skin Booster Serum?

A lightweight, watery peptide serum from COSRX, formulated with a blend of peptides to hydrate, smooth and support firmer-looking skin as a step after cleansing.

Is COSRX 6 Peptide Skin Booster Serum worth it?

Mostly yes. 10 of the 11 gurus who reviewed it give it their stamp of approval, for a Guru Score of 82%.

What is COSRX 6 Peptide Skin Booster Serum's Guru Score?

COSRX 6 Peptide Skin Booster Serum holds a Guru Score of 82%. That is our read on how warmly the experts talk about it, based on the verdicts of 11 expert reviewers we have collected.

Who is COSRX 6 Peptide Skin Booster Serum best for?

COSRX 6 Peptide Skin Booster Serum is generally suited to mature skin.

COSRX 6 Peptide Skin Booster Serum: a Guru Score of 82%

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.

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Darnell Cox | 50+ Healthy Aging Expert

55k subs

✓Yay

"I love this peptide. This is by COSRX, a six peptide skin booster. It evens skin tone, hydrates, helps with firmness and smoothness, pore and sebum care, and improves skin texture. It has [...] a copper peptide in it, [...] signaling peptides, and acetyl hexapeptide-8, so it smooths fine lines, and it's so cheap [...] I've got like six of them in the refrigerator because I use them over everything. [...] I am literally seeing a huge difference just from using this on my body every night."

All 6 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."

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"Those are the ones that I kind of showed you. Those are great peptides, all around good peptides. This one is super pricey, but man, I am telling you I'm noticing difference. And that is hard for me to do because it's hard for me to notice a big difference in stuff because I'm so consistent with my skin care routine, but when I started using this, it's like woah, okay, things are a little bit feel a little tighter. I don't know, but I love it."

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"Um, I think I'm going to go up in that. I love this because it comes in a pump. This is a six peptide skin booster. It's by COSRX. You can get it at Costco. It's from South Korea. It's great. Use it on your whole body. [...] Can you put this on your face? Absolutely. That's what it's designed for. But why are we not putting it on our bodies? It's basic. I don't want to say it's free, but it's really cheap, you guys. It's not expensive. [...] This is a great product to put everywhere."

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"This is the CosRX six peptide skin booster. Absolutely love this, I put it on my whole body. It's lightweight, like a toner, and blends six peptides to address fine lines, uneven texture, and loss of firmness. It's suitable for all skin types, and it's very cost effective, I don't think it's over $20."

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CYoung

95k subs

✓Yay

"I have recommended this cosrx peptide serum for about two years now, all skin types can go ahead and use it. It has multi-peptides in it and feels like a watery toner, but it's amazing if you pair it with a retinol, no problem at all."

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"They named it a serum but I use it like a toner, it's more watery. I was so surprised, this one is so moisturizing. Oily combo skin can try it out too, it's pretty okay for all skin types. It appeals to more people and you can use it all year round, so I'd give COSRX more points, a winner here. I put this in my 2024 Korean best skincare routine because I loved it, and trying it again I still do."

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"This contains six different peptides. Peptides work as anti-aging, they help other ingredients work better, it's a great assistant. It works for all different skin types. It's a bit tacky, but not too much, so you have to pat it in well. One good thing is I reach for this more often because of the pump, it's easy, not fussy. If you're using vitamin C or retinol, which can make your skin sting a little, you can put this on first and it works a lot better. It's an amazing booster."

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"It contains six peptides, the basic building blocks that make up proteins, and it's famous for ingredients that help collagen formation, the kind you usually see in luxury anti-aging products. [...] This one did an amazing job because it's really lightweight, and it's an amazing pair when you use it with vitamin C and retinol, it gives you a booster effect, as soon as you apply it you can feel your skin is moisturizing."

Doctorly

3.59M subs

✓Yay

"One of the most [...] under-sung peptide products of all time is actually the peptide toner serum from Cosrx. [...] They have two neuropeptides in here, [...] the one everybody knows, argireline or acetyl hexapeptide-8, but they also have syn-ake, another neuropeptide to inhibit the nerve stimulus for muscle movement. If you're looking for a peptide serum and you have wrinkles and you're trying to treat wrinkles, this is top-tier for the price point."

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"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."

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No BS Beauty

89k subs

✓Yay

"This one is the Cosrx 6 Peptide Skin Booster. Full of great peptides and ingredients in here. And pretty affordable, very large bottle."

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"This stuff is very watery. I don't really like the fact that they use the term serum there because it's not really a serum, it's not really an essence, it's not really a toner, but it is very liquidy. [...] If your essence is thick, I would apply it beforehand. If your essence is watery and runny, I would probably apply it afterwards. I [...] think of it more as like an in-between toner essence type product."

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"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."

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"Next up from COSRX is their 6 Peptide Skin Booster Serum, 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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"I'm going to use an essence, well it's the six peptide booster by COSRX, but it's watery so there we go. It feels like it's soaked in."

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"This one's pretty budget friendly, the CeraVe 6 Peptide Skin Booster, which is about 16 bucks. It's very liquidy, the bottle's gigantic, and it also contains a ton of amino acids, alanine, sodium hyaluronate. I'm not sure exactly how much they mentioned parts per million. It's so affordable I have a hard time thinking there's a whole ton of the peptides in here, but when there's a little bit more affordable you just don't really know how much of it they put in there."

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"I think of this more as an essence than a serum, but it's technically called a serum, the Cosrx 6 Peptide Skin Booster Serum. It's got six peptides as well as several amino acids, it's fragrance free, and a little bit of it goes a long way. The bottle's gigantic and about two pumps is enough for my face and neck. I really think of this more as an essence, to me it's not a serum, but anyway."

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"The six peptide serum booster this one is 15 bucks so I mean honestly buying it from yes style is great but if you don't have enough to fulfill the free shipping on yes style then it doesn't make sense to buy from them but at Amazon if you want to check it out then it's a deal because then you have to pay for the shipping so that one is also worth checking out"

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"What I love about this is I can fit this into my routine and I don't have to change anything else. I can use this after my normal toner and essence, pat this on, super light watery texture, and then I can go on to my serums and I don't have to change or take anything else out. In here we've got six different peptides, several amino acids, vitamin E, and it's really affordable."

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"The CeraVe 6 Peptide Skin Booster Serum has a liquidy texture but it's really quite nice. You can just use it as an essence. It's not really a serum texture, it's very liquidy, but it's quite nice. A lot of people really have good luck with it and it's really affordable. The bottle is huge, so this might be a nice way to fit a peptide in your routine."

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"I've been using it pretty much daily because it's so easy to fit into any routine. It's [...] got six peptides: arginine, copper peptide, beta white peptide which is a hyperpigmentation dark spot targeting peptide, nutrient peptide which is a soothing peptide, cinate peptide, and sh polypeptide 121, and also like some of the other products included several amino acids. It's got a water texture so it's super easy to fit into any routine right after cleansing and toning."

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"I like the fact that it's friendly for most skin types, sensitive, oily, dry, acne prone, pretty friendly for most skin types. Just wish they listed some percentages of something or at least list the percentage of peptide or something like that, but overall I'm very impressed with this. With a 10 being a perfect score, this one's a 9. Really lovely product, easy to enter into routine, very friendly for most skin types, and no fragrance. That's my favorite. It hits all my favorite spots."

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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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"This is a thicker serum and it's not greasy. [...] Before I apply it I found it's best to apply something first so it soaks in and smooths over skin [...] a little bit better. If I apply it just on plain dry skin it ends up peeling a little bit, so applying this or like even just a thicker essence first helps it smooth over skin better."

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"This one is the Cosrx 6 Peptide Skin Booster. Full of great peptides and ingredients in here. And pretty affordable, very large bottle."

Mad About Skin

732k subs

✓Yay

"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."

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"No, I fell in love with it. The texture is beautiful, it sinks into the skin so well, and the price point for what you're getting is divine. COSRX might not be my favorite skincare brand, but when they do a really good product I'm going to shout about it from the rooftops, and this is an example of a really well formulated Argireline peptide blend. Absolutely love it. If you're on a budget and looking for a cost-conscious option, Argireline is a non-negotiable in my skincare routine."

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"You've got six amazing different peptides in here to plump the skin, to hydrate it. It's going to minimize fine lines and wrinkles. It's got that Botox in a bottle effect. It's also got PDRN, which is a very, very hot ingredient at the moment. [...] That is a gentle exfoliator, will also fade hyperpigmentation. I think this is a standout, standout peptide serum. Honestly, I might not be a big fan of COSRX, but I'm going to say this, they've done right. It's also really affordable."

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"If your whole reason for skin caring is peptides, get this because it's got six of my favorite peptides in for firming and for giving you that long-term anti-aging. [...] This is a beautiful blend and I'll use this on the days where I want that little extra peptide action and it never lets me down. Super affordable price point, sinks into the skin so well, and it's slightly more watery than the others, [...] so for people that like a real lightweight serum this is going to do it for you."

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"It's a great all-rounder. Both are amazing, both are affordable, and both are beautiful on the skin. I can't choose between these two when it comes to my favorite drugstore peptide, so I'm awarding them equally. Both are absolute holy grails, and whichever you choose will slot seamlessly into your routine and definitely deliver some benefit."

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"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."

HotandFlashy

1.23M subs

✓Yay

"The COSRX 6 Peptide Skin Booster Serum, that's a really nice serum."

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"CosRx always has things in the Prime Day sale, and the six peptide booster will be at a discount. I know a lot of us use that and love it."

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"The one I'm most psyched about is the six peptide booster. Skinceuticals has a new product out with a bunch of peptides in it, [...] and this has all the same things but it doesn't cost like their product does. I bought this last week at full price."

Nipun Kapur

412k subs

✓Yay

"This is such a great product think about having a hyaluronic acid with more benefits"

Translated from the guru's original language.

AliceintheRabbitHole

59k subs

✓Yay

"I went through this skin booster the quickest out of everything because I really liked it. It's a very gentle product, it contains peptides, which act as a humectant and maybe do more for your skin, although we don't get much disclosure on the percentage of peptides, which is always very low. Overall I did like it, but I'm not going to run out and repurchase it because I want to see what else is out there."

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"I really, really liked this when I first tried it, I plowed right through it. I'm a peptides and toners fan so it just made sense that I loved it. But then I finished it and I went without it, and I didn't miss it as much as I thought I might. So I still like it, it's a runner up in this video, but I just can't call it my absolute favorite."

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"The COSRX Six Peptide Skin Booster is a nice hydrating [...] toner, I've already used up a full size bottle, [...] I like to make sheet masks from it. With peptides [...] we still need to establish effective levels and be clear about whether effective levels are in these products, and because of that I didn't rush out and repurchase this product, but I did like it."

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"Peptides are humectant ingredients and we know they're wonderful for hydrating your skin, and the brand claims some other benefits too, though that data is manufacturer supplied. I do believe, by the nature of humectants and the fact that it's just nice to apply, that [...] using this before other serums and ampoules helps. I love my peptides, I love my peptides."

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"When you look at the Korean label the actual use levels are pretty low, so I wouldn't rely on this as your main peptide product, but as a booster it gives additional hydration and helps other peptides absorb better. It's so well made that I can use multiple layers of it and my skin doesn't get sticky or tacky. It's really a hit for me."

Kelly Driscoll

91k subs

✓Mixed

"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 it works well as a booster, but it's important to know this isn't a highly concentrated serum, this is an essence. COSRX is using some more interesting peptides, and I think the mix delivers a more unique set of benefits. [...] There are some collagen stimulating peptides in here, though it's not a heavy focus of the six peptide mix they're using."

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"Absolutely not. Is this a great co-star, an additional product, a booster that you can add alongside a nice fully developed skincare routine to boost your results? Maybe, especially if you haven't quite hit all of your skincare goals just yet. And so for that reason alone I'm going to be rating this a seven out of ten. Once you understand how to use this in your routine, it could actually be very helpful as a co-star to the rest of your skincare products."

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Dr. Jenny Liu

324k subs

✓Yay

"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."