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COSRX The 6 Peptide Skin Booster Serum for dry skin

High

  • HighDry Skin Fit
  • HighEffectiveness
  • HighSafety

A great choice for dry skin; a few moisturizers fit it even better.

This fit is calculated for the concerns frequently associated with dry skin: flakiness, tightness, dehydration, fine lines, and wrinkles. For scores and recommendations based on your full skin profile, including your 12D face scan results and any goals or preferences you have, please use the Lovi app.

Page built Nov 8, 2026How the Fit score works

Lovi Assistant explains

  • This serum offers excellent moisturizing and anti-aging benefits for your dry skin, with acetyl hexapeptide-8 and copper tripeptide-1 working to plump and minimize fine lines. Sodium hyaluronate and glycerin provide essential hydration, addressing your dry or flaky skin concerns effectively.
  • Polyquaternium-51 offers additional occlusive action, enhancing the humectant properties of glycerin and sodium hyaluronate to further support your dry skin.
  • The formula is safe for your skin, as it contains no harsh or irritating ingredients.

How to apply

  • Could be used as part of your AM or PM routine. Start using it 3 times a week and work your way up to daily use.
  • Apply your moisturizer after your toner and before your sunscreen in the morning. At night, use it as the final step after your serum.
  • Gently press a small amount of the moisturizer into your skin. Avoid rubbing to keep your dry skin happy.
  • Apply the moisturizer on slightly damp skin to help lock in extra hydration. This is great for soothing dry and flaky areas .
  • Avoid the sensitive eye area and do a patch test before your first use .

People Say

★4.7Overall rating based on 5.4k+ reviews

Based on a very large amount of data, users consistently praise this serum as a lightweight, water-like "booster" that significantly improves skin texture and hydration without heaviness. It is widely celebrated for smoothing pores and creating a "glass skin" glow. A small minority of users with specific sensitivities experienced breakouts or closed comedones.

Highlights

  • Lightweight & fast-absorbing Mostly Mentioned
    • “absorbs instantly like water”
    • “non-sticky finish”
    • “perfect for layering”
    • “feels weightless on oily skin”
  • Hydrating & plumping Often Mentioned
    • “gives a healthy glow”
    • “skin feels plump”
    • “boosts hydration levels”
    • “glass skin effect”
  • Improves skin texture Often Mentioned
    • “skin feels softer immediately”
    • “smoothed out my texture”
    • “pores look smaller”
    • “reduced roughness”
  • Gentle & non-irritating Sometimes Noted
    • “no stinging on sensitive skin”
    • “soothing application”
    • “great for barrier repair”
    • “gentle enough for daily use”
  • Caused breakouts Rarely Noted
    • “gave me closed comedones”
    • “caused tiny whiteheads”
    • “broke me out after a week”
    • “bad reaction for acne-prone skin”
  • Ingredient sensitivities Rarely Noted
    • “reacted to the niacinamide”
    • “contains soy oil (allergy warning)”
    • “caused redness/flushing”
  • No visible results Rarely Noted
    • “did absolutely nothing”
    • “just expensive water”
    • “no change in fine lines”
    • “saw no difference after a bottle”
  • Sticky residue Rarely Noted
    • “felt slightly tacky”
    • “left a sticky film”
    • “clashed with other products”
    • “too slimy”

Sources: lovi.care, ulta.com, sokoglam.com, yesstyle.com, oliveyoung.com, amazon.com, and more

Questions and answers

What makes COSRX The 6 Peptide Skin Booster Serum a great fit for dry skin?

This serum is a great fit because sodium hyaluronate and glycerin bring essential hydration to soothe dry or flaky skin, while peptides work to plump and smooth fine lines. Polyquaternium-51 helps lock in moisture to keep your skin soft throughout the day, and the gentle formula is unlikely to cause irritation.

Clinical, Cosmetic and Investigational Dermatology, 2017American Journal of Clinical Dermatology, 2013

Which ingredients make this serum a good fit for dry skin?

Sodium hyaluronate and glycerin are the key ingredients that make this serum a great fit by providing essential moisture to help dry or flaky skin. Polyquaternium-51 helps lock in that hydration, while peptides like acetyl hexapeptide-8 and copper tripeptide-1 work to plump and smooth fine lines.

Clinical, Cosmetic and Investigational Dermatology, 2017

What does Hyaluronic Acid do for dry skin?

Hyaluronic acid draws moisture into dry skin, giving an immediate and lasting boost in hydration that helps smooth out fine lines and soften rough patches. It is very gentle and unlikely to cause irritation while improving overall skin smoothness and plumpness.

Dermatology and Therapy, 2021Journal of Drugs in Dermatology, 2011

What do Peptides do for dry skin?

Peptides help dry skin by supporting skin barrier health and improving moisture retention. Regular use may also enhance skin firmness and smooth out the texture of dry skin over time.

Advanced Science, 2025Journal of Cosmetic Dermatology, 2025

Where does this serum go in a skincare routine for dry skin?

This serum goes in the evening routine after cleansing and before your moisturizer. Putting it in the evening keeps things simple and helps avoid any extra sensitivity around sun exposure.

Can I use it with retinol, and in what order?

You can use this serum with retinol by applying the serum first to hydrate and soothe your skin, and then following with retinol. This combination helps keep your dry skin comfortable while managing fine lines, and it is unlikely to cause irritation since the formula is gentle.

Cutis, 2006Clinical, Cosmetic and Investigational Dermatology, 2017

How often should I use this serum?

You can use this serum in the evening as part of your routine. Daily application of moisturizers and treatments helps improve skin hydration and smoothness.

Journal of Cosmetic Dermatology, 2020Health Science Reports, 2021

Can it clog pores, cause breakouts or purging for dry skin?

This serum is unlikely to cause breakouts on dry skin, as it has a safe formula with a very low rate of complaints about pimples from reviewers.

Can I use this serum around the eyes or on my body?

Yes, you can safely use this moisturizing treatment around your eyes and on your body to help smooth and hydrate dry skin. The formula is well tolerated by delicate areas and supports skin softness.

Polymers, 2023Clinical, Cosmetic and Investigational Dermatology, 2017

Is it fragrance-free and alcohol-free?

Yes, it has no fragrance and no drying alcohol.

What the research says

  • A single application of a moisturizing fluid containing hyaluronic acid 1%, glycerin 5%, and Centella asiatica stem cells extract significantly increased skin hydration by 29% and reduced transepidermal water loss at 24 hours compared to baseline and an untreated control site in twenty healthy women.

    Clinical, Cosmetic and Investigational Dermatology, 2017
  • Argireline treatment twice daily for 4 weeks produced a significant anti-wrinkle effect with 48.9% total efficacy and decreased skin roughness in Chinese subjects compared with 0% efficacy and no decrease in roughness in the placebo group.

    American Journal of Clinical Dermatology, 2013
  • Argireline applied twice daily for 4 weeks achieved a total anti-wrinkle efficiency of 48.9% and notably reduced wrinkle depth compared to placebo in Chinese subjects.

    Journal of Cosmetic and Laser Therapy, 2013
  • Topical application of 0.1% hyaluronic acid formulations of different molecular weights led to significant improvements in skin hydration and elasticity, with low-molecular-weight formulations also significantly reducing wrinkle depth in seventy-six female subjects compared to a vehicle control.

    Journal of Drugs in Dermatology, 2011
  • Topical application of hyaluronic acid in conjunction with free gingival graft significantly reduced donor site postoperative pain until day 7 compared to normal saline, with no significant differences in graft dimensions or patient satisfaction.

    Clinical Oral Investigations, 2022
  • Treatment with a hyaluronic acid-containing mouth rinse or topical gel led to significant lesion reduction, pain relief, and normalization of lesion color in adult patients with minor recurrent aphthous stomatitis, with the gel formulation showing an earlier healing onset at 3 days.

    BMC Oral Health, 2019
  • Topical 2% N-acetyl glucosamine reduced facial hyperpigmentation in an 8-week split-face clinical test, with an even greater effect observed when combined with 4% niacinamide.

    Journal of Cosmetic Dermatology, 2007
  • N-acetyl-glucosamine-loaded nanostructured lipid carriers successfully delivered the hydrophilic agent through the skin and reduced melanin distribution in healthy volunteers.

    Advanced Pharmaceutical Bulletin, 2016
  • Topical cosmetic products containing hyaluronic acid, N-acetyl glucosamine, and gamma-amino butyric acid improved skin hydration by 24.28% to 33.60%, elasticity by 11.98%, and skin lightening by 5.26% over 2 months in 20 female participants.

    Journal of Cosmetic and Laser Therapy, 2019
  • Topical post-laser application of human adipocyte-derived mesenchymal stem cell media combined with niacinamide significantly improved wrinkle index, melanin index, patient satisfaction, and investigator esthetic improvement scores compared to vehicle cream in patients with aging skin.

    Journal of Cosmetic Dermatology, 2021
  • Topical nicotinamide prevented solar-simulated UV-induced immunosuppression in healthy volunteers, and men experienced immunosuppression at solar-simulated UV doses three times lower than those required for women.

    The Journal of Investigative Dermatology, 2008
  • Topical 5% niacinamide applied twice daily for 12 weeks reduced fine lines and wrinkles, hyperpigmented spots, red blotchiness, and skin sallowness, and improved skin elasticity compared to vehicle control in 50 female white subjects with facial photoaging.

    Dermatologic Surgery, 2005
  • Topical gel containing chitosan, 0.2% chlorhexidine, allantoin and dexpanthenol did not improve postoperative comfort regarding swelling and pain, but improved the wound's aesthetic appearance following impacted lower third molar extraction compared to no gel.

    Medicina Oral, Patologia Oral Y Cirugia Bucal, 2016
  • A topical gel containing chitosan, chlorhexidine, allantoin, and dexpanthenol significantly reduced postoperative pain, trismus, swelling, and analgesic consumption, while improving wound healing after third molar surgery compared to a placebo.

    Medicina Oral, Patologia Oral Y Cirugia Bucal, 2020
  • An overnight patch containing Allium cepa extract and allantoin safely promotes scar healing after dermatologic surgery, resulting in significantly greater reductions in observer- and patient-assessed POSAS scores compared to no treatment.

    Aesthetic Plastic Surgery, 2018

Ingredients

Water, Dipropylene Glycol, Glycerin, Pentylene Glycol, 1,2-Hexanediol, Niacinamide, Ammonium Acryloyldimethyltaurate Vp Copolymer, Polyacrylate Crosspolymer-6, Butylene Glycol, Xanthan Gum, Ethylhexylglycerin, Adenosine, Polyquaternium-51, Disodium Edta, Citric Acid, Caprylyl Glycol, Betaine, T-Butyl Alcohol, Sodium Pca, Sodium Lactate, Acetyl Hexapeptide-8, Copper Tripeptide-1, Pca, Sh-Polypeptide-121, Serine, Alanine, Allantoin, Sodium Hyaluronate, Acetyl Glucosamine, Glycine, Glutamic Acid, Lysine Hcl, Threonine, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Arginine, Tocopherol, Oligopeptide-68, Proline, Dextran, Palmitoyl Tripeptide-8, Glycine Soja Oil Soybean Oil, Hydrogenated Lecithin, Potassium Sorbate, Sodium Oleate

Behind this fit score

Lovi calculates every fit score from the full ingredient list with brand-independent rules our dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update.

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Prices checked 10 Oct – 16 Oct 2026

The Lovi Fit is the same in every country; only the stores and prices differ, and the ones here are for Spain.

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