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COSRX The 6 Peptide Skin Booster Serum

Ingredients and claims, checked

Last checked September 7, 2026

Buy on Olive Young US
Other stores (1)

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What is it like at a glance?

What the ingredients do

Hydration leads, with 7 of 44 ingredients. It also contains Sodium Lactate.

Hydration
7
Moisture seal
2
Skin protection
2
Exfoliation
1

Worth knowing

  • Contains drying alcohol
  • Has a fungal-acne trigger

Made for

What is this product?

It's a serum.

Key ingredients
Acetyl Hexapeptide-8, Copper Tripeptide-1, SH-polypeptide-121
When
Morning and evening

Who is it for?

Less suited to

  • Skin that reacts to alcohol

What to watch for?

Watch-outs

  • Contains drying alcohol
  • If you get fungal acne: Glycine Soja (Soybean) Oil

What is in it?

The full ingredient list as the brand publishes it, in the printed order. Tap a name to read about that ingredient.

This brand publishes its ingredient list in Korean only. Names below are the matching INCI names from the Korean Cosmetic Association ingredient dictionary, except 4 with no dictionary entry, left in Korean.

Key ingredientWorth a closer look

Ingredients with no mark are ones we found nothing notable about, and when marks overlap on one ingredient we show the caution first.

1 of the ingredients our research flagged could not be matched to a name in the list above.

What the claims add up to

Only partly backed:
less visible dark spots · softer-looking fine lines
See each claim, checked (2)

Claims, checked

  • The 6 Peptidebacked by evidence
  • Functional cosmetic status: wrinkle improvement / whitening functional productplausible, not tested

We quote each claim exactly as the brand published it, then check it against the ingredient list and the brand's own documents.

How we check claims

Which articles cover it?

Articles on this site that write about this product.