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  • Writer's pictureK Beauty Hobbit

COSRX The 6 Peptide Skin Booster Serum Review

Updated: Mar 11

This post contains affiliate links. Product provided by Jolse.


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It took me a while to truly appreciate CosRx (I used to think it was just for teenagers), but now I love it. If you are anything like me, you’ve already seen the new CosRx The 6 Peptide Skin Booster Serum all over your social media. I had to try it too - I got mine from Jolse.


This “do it all” serum promises to help with elasticity, texture, and pore appearance. The star ingredients are niacinamide, hyaluronic acid, allantoin, and of course the peptides. The 6 Peptide Skin Booster Serum aims to boost collagen production and even make your subsequent skincare products more effective.


COSRX The 6 Peptide Skin Booster Serum

How to use

  • Apply on clean skin as the first step of post-cleansing skincare

  • Gently pat in

  • Follow with the rest of your routine


I do not notice a scent at all. The texture is very pleasant - slightly thicker than water with a lovely “slip” - I find myself spending a few extra moments massaging my face just because it feels so nice under my fingertips. While some marketing materials recommend using multiple layers of the booster (if desired), one go of 1-2 pumps is enough for my face and neck.


My impressions

Well, this is amazing. I’ll start with the one small thing that I would change - the name. A lot of newer kbeauty enthusiasts are used to the toner - serum - cream routine order, and seeing “serum” in the title will probably make them expect something thicker to be used after toner. I would have left this as a “booster” or even called it a “toner”. The more naming liberties the brands take, the less meaningful those product names become to consumers. I suppose that’s why some of you read reviews - to see what things are actually like.

I have combination skin and seeing “lifting” and “elasticity” benefits gets me cautiously excited. Can a topical product lift all of my past mistakes and three decades of life? No. But it can help with some things, and maybe even prevent premature aging? Hopefully.


COSRX The 6 Peptide Skin Booster Serum

I absolutely love the texture of this CosRx booster. It’s so easy and pleasant to apply. I’ve been reaching for it every night since I got it. I cannot tell if it’s truly making the rest of my skincare more effective (in a sense, all toners do that, because damp skin absorbs skincare better), but if it does - great. What I do see is an overall improved hydration, brightness, and skin texture. I don’t have a lot of visible texture issues, but I can tell the difference to the touch - my face, especially the cheeks, is so much smoother and softer than before.


The pump deserves a special mention - I wasn’t sure how well that would work for a more or less liquid product like this one, but it makes dispensing super easy and convenient. Maybe more toners and essences should utilize this packaging style.


I’m so glad I got to try this, and I expect the hype around CosRx The 6 Peptide Skin Booster Serum to continue. 



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COSRX The 6 Peptide Skin Booster Serum 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, Caprylyl Glycol, t-Butyl Alcohol, Potassium Sorbate, Sodium Oleate

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