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COSRX

COSRX The 6 Peptide Skin Booster Serum

Ingredient analysis and how the ad lines read

Read on 2026-09-07

What is this product?

COSRX's The 6 Peptide Skin Booster Serum earns its name on paper: exactly six named peptides, each with a disclosed amount down to the ppm, sit right after niacinamide in a 150ml serum that the brand's own spec sheet lists as a Korean anti-wrinkle and whitening functional cosmetic. Worth knowing before buying: a separate retail listing for what looks like the same formula records no such functional filing at all, so that regulatory claim is not settled across the sources checked. No fragrance ingredient and no exfoliating acid turned up anywhere in the 44-item formula; a tert-butyl alcohol entry near the end sits beside potassium sorbate, more likely doing preservative work than skin-drying duty.

What makes it different?

The six peptides carry individually disclosed concentrations from 5 ppm down to 0.02ppm, which is unusually granular labeling for a mid-tier serum. In the surfaces checked here it appears in one size only, 150ml, through the brand's own mall and, under a different product name, through a domestic collaboration bundle with a figure premium, where the retail record writes the quantity as 150ml+150ml because the bundle ships two units; no overseas listing turned up in those pages.

What is in it?

The full ingredient list as the brand publishes it, in the printed order. Each name links to what we know 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 5 with no dictionary entry, left in Korean.

Key ingredient

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

We could not place these in the list above: 돌콩오일 (Glycine Soja (Soybean) Oil), 하이드로제네이티드레시틴 (Hydrogenated Lecithin)

Did the ad claims hold up?

We checked 2 lines this product advertises against the ingredient list and public documents. One of them holds up. The rest are only partly right or have nothing behind them.

Claims translated from Korean, originals preserved.

backed by evidence1

  • The 6 Peptide
    Korean original

    더 6 펩타이드

likely, not proven1

  • Functional cosmetic status: wrinkle improvement / whitening functional product
    Korean original

    기능성 화장품 여부: 주름개선 / 미백 기능성 제품

Each line is quoted as the brand published it, and each one was read on its own against the ingredient list and the documents the brand publishes.

How we read these lines

Which articles cover it?

Articles on this site that write about this product.