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COSRX The 6 Peptide Skin Booster Serum
Bestseller
COSRX

The 6 Peptide Skin Booster Serum

Serum · 150 mL

26%$18.30$24.81

Where to buy

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Key ingredients

PeptidesNiacinamideAllantoinHyaluronic Acid

Found in the full ingredient list below. Check how it layers with your routine

Made for

DryOilyCombinationSensitiveNormal
Full ingredients (44)
  1. Water
  2. Dipropylene Glycol
  3. Glycerin
  4. Pentylene Glycol
  5. 1,2-Hexanediol
  6. Niacinamide
  7. Acetyl Hexapeptide-8
  8. Copper Tripeptide-1
  9. sh-Polypeptide-121
  10. Dipeptide Diaminobutyroyl Benzylamide Diacetate
  11. Oligopeptide-68
  12. Palmitoyl Tripeptide-8
  13. Allantoin
  14. Sodium Hyaluronate
  15. Acetyl Glucosamine
  16. Serine
  17. Alanine
  18. Glycine
  19. Threonine
  20. Arginine
  21. Proline
  22. Betaine
  23. Sodium PCA
  24. Sodium Lactate
  25. PCA
  26. Glutamic Acid
  27. Lysine HCl
  28. Tocopherol
  29. Dextran
  30. Glycine Soja (Soybean) Oil
  31. Hydrogenated Lecithin
  32. Ammonium Acryloyldimethyltaurate/VP Copolymer
  33. Polyacrylate Crosspolymer-6
  34. Butylene Glycol
  35. Xanthan Gum
  36. Ethylhexylglycerin
  37. Adenosine
  38. Polyquaternium-51
  39. Disodium EDTA
  40. Citric Acid
  41. Caprylyl Glycol
  42. t-Butyl Alcohol
  43. Potassium Sorbate
  44. Sodium Oleate

Listed from highest to lowest concentration. Formulas change, so check the packaging if you avoid an ingredient.

Product details

A bottle of The 6 Peptide Skin Booster Serum floating among splashes of clear water on grey

Firm + refine

Six peptides in a watery first-step serum that leaves skin softer, smoother and clearer-looking.

COSRX’s booster goes on right after cleansing. Each of its six peptides takes on a different job, from firmness and texture to pores and tone, backed by niacinamide, hyaluronic acid and amino acids. It layers easily under any active you already use.

Peptides, each with its own job
6
Peptides, each with its own job
Niacinamide’s place on the list
#6
Niacinamide’s place on the list
Big bottle, all skin types
150 mL
Big bottle, all skin types
A swipe of clear, bubbly serum with round droplets on pale pink

What’s inside

The ingredients doing the work

  • Firming peptides

    Three peptides COSRX uses for firmness, a bouncier feel and smoother-looking texture.

    No. 7, 8, 9 of 44 on the list

  • Clarifying peptides

    Three more for excess oil and pores, a brighter tone and calmer skin.

    No. 10, 11, 12 of 44 on the list

  • Niacinamide + NAG

    Niacinamide helps with dark spots and oiliness, while N-acetyl glucosamine gently smooths the surface.

    No. 6, 15 of 44 on the list

  • Hyaluronic acid + amino acids

    Hydrators and building blocks of skin’s natural moisturizing factor, to keep the barrier comfortable.

    No. 14, 16, 20, 23 of 44 on the list

  • Allantoin + adenosine

    A soothing ingredient and a wrinkle-care one, rounding out the formula.

    No. 13, 37 of 44 on the list

A bottle of The 6 Peptide Skin Booster Serum beside drops of clear serum

How to use

Your first step after cleansing

  1. 1

    Cleanse

    Wash your face and pat it dry.

  2. 2

    Dispense

    Pump a few drops of the clear, watery serum into your palm.

  3. 3

    Pat

    Press it over face until absorbed. It preps skin for whatever comes next.

  4. 4

    Layer

    Follow with your other serums and moisturizer, then sunscreen in the morning.

A single clear drop of serum on blush pink

Soft, smooth, clear skin

One quick first step that makes the rest of your routine work a little harder.

Good to know

  • Suitable for all skin types. Dermatologist tested, tested on sensitive skin and tested non-comedogenic, per COSRX.
  • Made to layer: COSRX pairs it with its vitamin C, retinol, niacinamide, hyaluronic acid and Advanced Snail lines.
  • Contains soybean oil. Skip it if you have a soy allergy.
  • 150 mL bottle.