Obagi C20 Vitamin C Serum 15ml - 20% high-concentration vitamin C serum for dark spots Japan

Obagi C20 Vitamin C Serum 15ml

$89.31
$89.31 $91.67
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Obagi C20 Vitamin C Serum 15ml - 20% high-concentration vitamin C serum for dark spots Japan
Obagi C20 Vitamin C Serum 15ml
Obagi

Obagi C20 Vitamin C Serum 15ml

$89.31
$89.31 $91.67
In stock
  • ✅ 20% pure ascorbic acid — intensive pigmentation potency
  • ✅ Deep C Porter + Advanced C Control EX dual delivery
  • ✅ Signal Lock Complex maintains hydration at high concentration
  • ✅ Larger 15ml bottle — more intensive treatment format
  • ✅ Rohto pharmaceutical-grade Japan-domestic formula
  • ✅ Free from parabens, mineral oil, colorants

🛡️ 100% Authentic – Japan domestic version
🚚 Ships from Tokyo
✨ Delivery in 4-6 business days

Description

Obagi C20 Vitamin C Serum 15ml is the high-intensity step in the Obagi C Series — delivering 20% pure L-Ascorbic Acid for skin with established Vitamin C tolerance, persistent sun spots, enlarged pores, and deep dullness that has not fully resolved at lower concentrations. It is supplied in a 15ml bottle (larger than the 12ml C5 and C10) reflecting its use as a sustained-course treatment.

  • 20% pure L-Ascorbic Acid — high-dose concentration for intensive brightening, pore control, and antioxidant protection
  • Deep C Porter technology (Iris Root Extract + Advanced C Control EX) — dual delivery and stabilisation system for enhanced penetration at this elevated concentration
  • Signal Lock Complex — maintains moisture and skin comfort alongside the high-concentration active
  • Tocopherol (Vitamin E) — synergistic antioxidant that stabilises L-Ascorbic Acid and supports skin condition
  • 15ml — larger volume accounts for the sustained 3–6 month course recommended for clinical-level dark spot improvement
  • Not recommended as a first Vitamin C serum — requires prior Vitamin C tolerance established at C5 or C10

How it works: At 20%, L-Ascorbic Acid achieves a skin tissue concentration high enough to produce measurable collagen synthesis stimulation — a benefit that lower concentrations provide minimally or not at all. This collagen effect, combined with intensified melanin inhibition, is why the C20 is the first concentration in the series where visible reduction of established sun spots (not just prevention of new ones) becomes achievable for most skin types.

Who should use C20 vs C10: C20 is for skin that has used C10 consistently for at least 3 months without significant irritation and still has persistent pigmentation concerns — stubborn spots, deep dullness, or visible textural roughness — that the C10 has not fully addressed. Do not start with C20 if Vitamin C is new to your routine; tolerance-building at C5 or C10 first reduces the risk of barrier disruption at this concentration.

Known in Japan as オバジ C20セラム 15ml.

Key Ingredients
  • Ascorbic Acid (Pure Vitamin C) — 20% high-dose brightening, pore control, and antioxidant treatment
  • Tocopherol (Vitamin E) — stabilises vitamin C and reinforces skin moisture barrier
  • Iris Root Extract — Deep C Porter component; facilitates vitamin C delivery to stratum corneum
  • Centella Asiatica Extract — calms skin sensitisation at high potency while supporting collagen
  • Artichoke Leaf Extract — pore-tightening action via NF-κB pathway modulation

HOW TO USE
  1. Cleanse and apply toner to thoroughly prep and hydrate skin.
  2. Dispense 3–4 drops into your palm using the dropper.
  3. Press gently across the face, concentrating on dark spots and dull areas.
  4. Follow with emulsion or moisturiser to buffer and seal.
  5. Pro tip: At 20% concentration, always apply on well-moisturised skin. If tingling is strong, apply after emulsion rather than before.

FAQ

How is C20 different from C25 Neo?

C20 provides 20% pure vitamin C with the full Obagi C series technology. C25 Neo adds two additional exclusive actives — Power Claw (harpagophytum root extract) and White Signal Complex — enabling it to also target fine lines and loss of firmness. C20 focuses on brightening and pore care; C25 Neo is the full-spectrum anti-aging option.

Is C20 suitable for daily use?

Yes, Obagi recommends twice-daily use morning and evening. Introduce it gradually if you're new to 20% concentration — start with once daily, then build up as your skin adapts.

Why is C20 a larger bottle than C10 or C25?

C20 comes in 15ml versus 12ml for C10 and C25 Neo. It reflects Obagi's positioning of C20 as an intensive treatment format for established users who use higher volumes per application.

Is this the Japan-domestic version?

Yes. Sourced from Japanese drugstores including Matsumotokiyoshi, this is the genuine Japan-domestic formula by Rohto — the same product sold in Japanese pharmacies, not an export version. TokyoShelf sources only domestic-market formulas.

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