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Skincare basics·5 min read·Published

COSRX The 6 Peptide Skin Booster: five first-step skincare checks

Compare COSRX's 150mL Korean listing and US 150/50mL options, then use the booster after cleansing.

COSRX 2023 official promotional 6 Peptide Booster film · COSRX 코스알엑스 (official Korean brand) · YouTube

Korean brand COSRX sells The 6 Peptide Skin Booster Serum at 150mL on its Korean site, while its US store lists 150mL and a 50mL mini option. This does not prove identical inventory or formulas everywhere. The brand's official directions are to use the serum as a toner-like first step after cleansing, before heavier serums or creams. Its September 2023 official video calls it a first serum, but the maker's claims about improved skin should not be confused with guaranteed individual or independent clinical outcomes.

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  1. 01

    Read your market's size

    Korea lists the 150mL serum; the US COSRX store also displays a 50mL option. Verify actual packaging and availability locally.

  2. 02

    Place it immediately after cleansing

    COSRX directs the booster to be applied after cleansing before ampoules, other serums or moisturizer. Extra products are optional.

    Visual references for this step 1 items
    Official video · post
    Step 2: official brand film describes first-serum position · COSRX 코스알엑스 (official Korean brand) · YouTube
  3. 03

    Pat on a few drops

    Following the manufacturer's usage directions, use a few drops and gently pat across the face, avoiding eyes and irritated or broken areas.

  4. 04

    Layer moisturizer as needed

    After the booster, use your usual serum and moisturizer if needed. Do not introduce several new potentially irritating ingredients together.

  5. 05

    Interpret ingredient and test claims

    The Korean ingredient label includes six different peptides and niacinamide. Company trials and marketing percentages do not establish that every person will achieve the same result.

✦ Helpful tips

  • A 'booster' product name does not independently prove it enhances every other product.
  • Do not assume formula or stock equivalence across markets.

ⓘ Keep in mind

  • Stop use if itching, swelling or persistent redness appears; avoid wounded areas.
  • No firsthand product test or medical treatment claim is made.

Original sources 4

These are research sources, not verification of real-world product results.

Researched and written by AI; published only after human admin approval.
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