OOTD Dark Spot Vitamin C Serum Mask (1) is a single-serve sheet mask that combines "vitamin C brightening & spot-reducing" with "deep hydration," designed for daily use to improve skin clarity. Its core features are:

1. High-Efficiency Vitamin C Derivatives: The mask uses stable vitamin C derivatives (e.g., sodium ascorbyl phosphate) instead of pure vitamin C — this avoids oxidation, ensures the ingredient remains effective, and reduces irritation, safely brightening skin and fading dark spots.
2. Serum-Rich, Skin-Fitting Sheet: The mask sheet is made of ultra-thin, breathable fiber (e.g., hydrogel or cotton) that fits tightly to facial contours (covering the T-zone, cheeks, and jawline). It locks in a high concentration of serum (25-30ml per sheet), ensuring full absorption of nutrients.
3. Dual Benefits: Brightening + Hydration: In addition to vitamin C, the serum contains hyaluronic acid, glycerin, and panthenol — these ingredients work together to hydrate the skin, plump fine lines, and enhance the brightening effect, leaving skin radiant and soft after use.
4. Single-Serve, Hygienic Packaging: Each mask is individually sealed, preventing ingredient contamination and preserving serum freshness. It’s lightweight and portable, ideal for travel or on-the-go skincare.
5. Gentle, Non-Irritating Formula: Free of alcohol, artificial colorants, parabens, and mineral oil — tested for skin irritation, making it suitable for long-term, frequent use (2-3 times a week) without damaging the skin barrier.

• All skin types

• Made in :Korea

（specific ingredients are subject to product packaging; core components listed below）：
Key Active Ingredients (Brightening & Spot-Reducing):
Sodium Ascorbyl Phosphate (Vitamin C Derivative): A stable, low-irritation vitamin C derivative — inhibits melanin production, fades existing dark spots, and brightens overall skin tone without oxidation in air.
Niacinamide (Vitamin B3): Complements vitamin C to enhance spot-reducing effects, improves skin barrier function, and reduces the appearance of pores, creating a smoother complexion.
Moisturizing Ingredients:
Sodium Hyaluronate (Hyaluronic Acid): A multi-molecular humectant that absorbs 1000x its weight in water, hydrating the skin’s surface and deep layers, reducing dryness and fine lines.
Glycerin (Vegetable-Derived): A natural humectant that attracts moisture from the air to the skin, maintaining long-lasting hydration and preventing tightness after mask use.
Panthenol (Vitamin B5): Converts to pantothenic acid in the skin, soothes mild irritation, repairs the skin barrier, and enhances moisture retention.
Mask Sheet Material:
Hydrogel or Cotton Fiber: Ultra-thin, breathable, and highly absorbent — hydrogel sheets lock in more serum and conform to facial curves, while cotton fiber sheets are lightweight and suitable for sensitive skin.
Preservatives & Stabilizers:
Phenoxyethanol (≤1%): A mild, EU-approved preservative that inhibits bacterial growth in the serum, extending the product’s shelf life (24 months unopened) without skin irritation.
Disodium EDTA: A chelating agent that binds to metal ions in the formula, preventing ingredient oxidation and maintaining the stability of vitamin C and moisturizing components.
Harsh Substance-Free: Free of alcohol, artificial colorants, parabens, mineral oil, and sulfates (SLS/SLES) — meets "clean skincare" standards, safe for daily use and sensitive skin.

Prepare the Skin: Clean your face with a mild cleanser and pat dry. Apply a toner (optional) to balance skin pH and enhance serum absorption.
Open & Apply the Mask: Tear open the mask package, unfold the sheet, and align it with your eyes, nose, and mouth. Smooth the mask gently with your hands to remove air bubbles, ensuring full contact with the skin.
Relax & Wait: Leave the mask on for 10-15 minutes (do not exceed 20 minutes, as this may cause the mask to dry and reverse moisture absorption). During this time, avoid facial movements (e.g., talking, laughing) to keep the mask in place.
Massage & Absorb: Remove the mask and gently massage the remaining serum into your face and neck with your fingertips until fully absorbed (no need to rinse, as the serum continues to nourish the skin).
Follow-Up Care: For optimal results, apply a moisturizer or facial oil after absorption to lock in moisture and extend the brightening effect. Use 2-3 times a week for consistent skin improvement.