IOPE Vitamin C Expert 40% Mask Concentrate: High-Dose Vitamin C in a Masking Format

IOPE's Vitamin C Expert 40% Mask Concentrate is one of the highest-concentration vitamin C products in Korean skincare, delivering 40% vitamin C (a stabilized derivative) in a short-contact mask format. Because 40% is too aggressive for daily leave-on use, the mask format limits skin exposure to 10 to 15 minutes, allowing a short, powerful dose without overwhelming the skin.

This is a targeted treatment, not a daily serum. Users with stubborn pigmentation, deep dullness, or pre-event glow needs use this once or twice weekly for accelerated brightening. The texture is a thick concentrate you apply like a mask and rinse off after 15 minutes, similar to a clay or cream mask but with vitamin C as the hero.

What It Does

40% vitamin C delivers high-dose antioxidant protection, pigmentation fading, and collagen support in 15 minutes. The mask format concentrates the dose: more product, shorter contact time, more punch than daily serums. Supporting ingredients include niacinamide and peptides for enhanced brightening synergy.

Who It's For

• Stubborn pigmentation: Accelerated fading support.
• Pre-event glow: Same-day brightness boost.
• Dull skin reset: Weekly maintenance.
• Vitamin C tolerance builders: Short contact = less irritation.
• IOPE routine users: Pairs with daily vitamin C serum.

Key Specs

• Volume: 15g
• Price: $68.64
• Hero active: 40% vitamin C (stabilized derivative), niacinamide, peptides
• Format: concentrated mask
• Fragrance: light

How to Use

After cleansing and toner, apply a thick layer to clean skin. Leave on 10 to 15 minutes (not longer). Rinse thoroughly with water. Follow with moisturizer. Use 1 to 2 times per week, not more. Always pair with daily SPF.

FAQ

40% is crazy high, is it safe?

In a rinse-off mask format, yes. The short contact time prevents over-exposure. In a leave-on serum, 40% would be too aggressive for most skin.

Will it sting?

Tingling is common and normal. Strong burning is not; rinse immediately if you experience severe burning.

Can I use with other actives?

On mask day, skip other strong actives (retinol, strong acids). Use simple soothing products after the mask.

Pregnancy-safe?

Generally yes, but the high concentration warrants consulting your OB.

How long does 15g last?

2 to 3 months at 1 to 2x weekly use.

Related Products

Pair with the IOPE collection or browse Korean masks and best Korean products for dark spots.