High-Strength Vitamin C Serum for Normal to Oily & Combination Skin
Professional-C® Serum 20% is Obagi’s bestselling high-concentration Vitamin C serum formulated with 20% L-Ascorbic Acid and Sodium Hyaluronate. Designed for normal to oily and combination skin types, this fast-absorbing formula helps promote brighter-looking skin, improve uneven tone, and support antioxidant defence.
This advanced-strength serum is ideal for experienced Vitamin C users seeking enhanced visible radiance and improved skin clarity.
What It Helps Improve
Uneven skin tone
Appearance of dark spots
Fine lines and wrinkles
Dull complexion
Visible signs of environmental stress
Clinically Evaluated & Consumer Reported Results*
91% reported skin appeared brighter and more hydrated
Demonstrated antioxidant potential against environmental stressors**
*Based on Obagi survey analysis. Data on file at Obagi Cosmeceuticals LLC.
**In-vitro antioxidant potential assay (2023). Data on file at Obagi Cosmeceuticals LLC.
Key Ingredients
L-Ascorbic Acid (20%)
The purest and most potent form of Vitamin C. Helps neutralise free radicals, support collagen appearance, and promote brighter, more even-looking skin.
Sodium Hyaluronate
A hyaluronic acid derivative that supports hydration and helps maintain skin comfort.
Ascorbyl Glucoside
A Vitamin C derivative that enhances antioxidant support.
Key Benefits
20% pure Vitamin C
High-strength antioxidant serum
Fast-absorbing formula
Supports brighter, smoother-looking skin
Designed for normal to oily skin types
How to Use
Apply 5–7 drops in the morning after cleansing and toning.
Apply before moisturiser.
Follow with broad-spectrum SPF before makeup.
Use within 3–6 months after opening for optimal performance.
Who Is It For?
Normal to oily skin
Combination skin
Experienced Vitamin C users
Individuals concerned with uneven tone
Those seeking high-strength antioxidant protection
Full Ingredients (INCI)
Propylene Glycol, Aqua/Water/Eau, Ascorbic Acid, Alcohol Denat., Ascorbyl Glucoside, Ethoxydiglycol, Sorbitol, Sodium Hyaluronate, Fragrance (Parfum), Citrus Aurantium Dulcis (Orange) Peel Extract, Citrus Paradisi (Grapefruit) Fruit Extract, Phenoxyethanol, Calcium Hydroxide, Zinc Chloride, Citric Acid, Caprylyl/Capryl Glucoside, Amyl Cinnamal, Limonene, Hexyl Cinnamal, Benzyl Benzoate.
Storage
Store below 25°C.
Keep out of direct sunlight.
Store in a cool, dark place after opening.
Keep cap tightly closed.