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Skincare basics·5 min read·Published

MEDIHEAL PDRN serum: five checks for Korea's 40mL versus Japan's 2026 50mL

Distinguish the Korean PDRN Pore Firming Serum 40mL from the PDRN Derma Serum 50mL introduced in Japan in September 2026, without assuming shared formulations.

September 2026 MEDIHEAL Japan PDRN Derma Serum and Mask commercial, not Korea's 40mL serum · MEDIHEAL Japan campaign · YouTube

Korean K-beauty brand MEDIHEAL lists a PDRN Pore Firming Serum 40mL in its domestic store. In Japan, the brand announced a different-named PDRN Derma Serum 50mL with a September 8, 2026 general release and a special one-serum/two-mask bundle. Different names, volumes and market labels do not establish that the formulations are the same. The linked original September 2026 brand commercial specifically promotes Japan's serum and mask, not a controlled skin-result test or a video demonstration of Korea's 40mL item. Do not read pore or firmness advertising as independently proven treatment efficacy.

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  1. 01

    Find the Korean 40mL label

    The Korean manufacturer's product is named 'PDRN Pore Firming Serum 40mL'. Check your own packaging, ingredients and volume, not just the PDRN keyword.

  2. 02

    Identify Japan's September 2026 50mL version

    The Japanese MEDIHEAL release dated September 7 says the PDRN Derma Serum is 50mL, generally released September 8. One launch bundle included a 50mL serum and two serum masks. Availability of that exact promotional kit varies by date and store.

    Visual references for this step 1 items
    Official video · post
    September 2026 MEDIHEAL Japan PDRN Derma Serum and Mask commercial, not Korea's 40mL serum · MEDIHEAL Japan campaign · YouTube
  3. 03

    Do not assume PDRN implies identical formulas

    Japan's announcement describes its PDRN ingredient as DNA-Na; Korea's 40mL INCI lists sodium DNA. Matching one ingredient term does not establish the same concentration, full formula or performance. The brand's '99% purity' statement refers to a raw material, not 99% PDRN in the bottle or independent clinical proof.

  4. 04

    Apply the Korean 40mL serum after toner

    Korean manufacturer directions say to use after toner, spread an appropriate amount along skin texture and pat gently. For the Japanese 50mL item, follow that market's own packaging; there is no requirement to purchase the bundle masks.

  5. 05

    Read the commercial and monitor irritation

    The 2026 Japanese film is branded advertising for its domestic serum and masks, not evidence that Korea's 40mL formula performs the same. Stop using after irritation and use separate sun protection by day.

✦ Helpful tips

  • Do not assume identical ingredients or market availability merely from the shared 'PDRN' name.
  • The linked video is Japanese brand advertising, not a user review or independent clinical trial.

ⓘ Keep in mind

  • Keep away from damaged skin and unintended sensitive areas; stop for redness, itching or swelling and seek medical care if severe or persistent.
  • Product claims about firmness and pores are not a diagnosis, medical treatment or independently verified outcome.

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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