LayerwisePassport · Decoded
Japanese Product PassportSingle-dose zero-oxidation ascorbic acid benchmark2022–2026 Production

Yunth

Yunth Pure Vitamin C Whitening Serum (28 Single-Use Sachets)

Domestic Japanese Name: Yunth 生VC美白美容液 (医薬部外品)

Japan's viral 30-second freshness quasi-drug serum delivering 100% waterless pure ascorbic acid in 28 single-use nitrogen-sealed aluminum sachets to completely eliminate bottle oxidation in tropical humidity.

  • Quasi-Drug
  • Pure Vitamin C
  • Single-Dose Sachet
  • Zero Preservatives
Shortlisted · Sourced wear profile

Formulation Renewal & Version Diff

Tracking formulation and packaging transitions between domestic Japanese releases.

Current Edition2022–2026 Production

Key Formulation Adjustments

  • Optimized nitrogen-purge sealing during sachet packaging
  • Enhanced heat-stability rating for tropical import shipping
  • Received 2025 Rakuten and variety store Hall of Fame inductions
How to Spot on Shelf:

Ensure box states '1ml × 28包' with the gold foiled Yunth brand mark on white cardstock.

Official Japanese Wear Protocol

Manufacturer directions and dosage transcreated for high-humidity climates.

Recommended Dosage1 full sachet (1.0 mL) immediately upon tearing open
Pre-Makeup Settle Time45–60 seconds
Cleansing MethodDissolves completely with regular daily foam cleanser or gentle face wash.

Application Sequence

  1. 1Tear open one sachet right after morning or evening face wash
  2. 2Empty entire 1 mL contents into dry palm
  3. 3Smooth warmly across face and neck, pressing into hyperpigmented zones
  4. 4Follow with watery lotion or hydrating essence after 60 seconds
Wear Cautions:
  • Must be applied immediately upon tearing open for maximum antioxidant freshness.
  • A mild warming sensation on contact is normal from anhydrous polyol dissolution.

Standardized Climate Telemetry

Empirical wear behavior observed under high heat and tropical humidity.

Spread and drag

Concentrated dry-oil slip; 1 mL generous sachet dose glides freely over face, neck, and décolleté

Finish after 15 minutes

Silky warming cushion; absorbs fully in 60 seconds into a soft, non-tacky priming base

Visible white cast

100% transparent; clear fresh active fluid vanishes into skin with zero residue

Eye-area comfort

Mild warming sensation; keep 1 cm away from direct orbital lashline

Pilling with a routine

Exceptional under sunscreen; absence of silicones or gums prevents rolling or pilling

Warm-weather commute

Waterless formulation bonds to skin; resists commuter perspiration wash-off in 85% humidity

Reapplication

Single daily sachet application provides 24-hour antioxidant defense; midday touch-up unnecessary

Verified Retail Sources

Authentic distribution channels with direct pricing across key regions.

Purchases made through authorized retailer links may earn Layerwise a small commission, supporting independent research without extra cost to you. Commercial relationships never alter test protocols, rankings, or wear observations.