Vitamin C 21.5% Advanced Serum
A high-strength vitamin C serum in a sea buckthorn water base, made for working on dark spots, uneven tone, and general dullness. It's a thin, fast-absorbing liquid with a faint orange tint. It suits skin that already handles active ingredients better than it suits total beginners.
More detail
The main active is 21.5% pure ascorbic acid, a potent antioxidant that helps fade pigmentation and supports the skin's own collagen, carried in sea buckthorn water instead of plain water. Sodium hyaluronate, panthenol, and allantoin add hydration and help keep the skin calm alongside it. It's alcohol-free and fragrance-free, with a light, slightly slippery feel. Apply a few drops to clean skin before moisturizer; many people use it in the morning and follow with sunscreen. Pure vitamin C at this strength can tingle or sting, so start with a few times a week, patch test, and keep the bottle away from light and air since it oxidizes over time.
Ingredient check✓ all clear
Evidence checkGrade A
How grading works
What Korea says#40 serum
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Where to buybest total $27
| Retailer | Price | Ship + duty | Total | |
|---|---|---|---|---|
| Amazon ✓ official Official store — verify seller before launch Accepts: Visa · MC · Amex · Discover · Amazon Pay · Affirm | $27 | — | $27BEST | Shop → |
| Olive Young Global ✓ official Ships from Korea 7–14d · +15% duty Accepts: Cards · PayPal · Apple Pay · Alipay+ | $22 | $10.30 | $32.30 | Shop → |
| By Wishtrend official ✓ official Brand's official store, ships from Korea · +15% duty Accepts: Cards · PayPal (varies) | $27 | $10.10 | $37.10 | Shop → |
Totals include estimated import duty on Korea-shipped orders (15%, post–de minimis). Links open retailer search; exact product links are coming at launch. Payment methods indicative — verify at checkout.
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