Obagi Professional C Serum 20%: The Ideal Entry-Level Medical Grade Vitamin C

Obagi Professional C Serum 20% is the perfect starting point for anyone new to medical-grade vitamin C, or for those with sensitive and combination skin seeking powerful antioxidant benefits without the risk of irritation. Formulated with 20% pure L-Ascorbic Acid — the most bioavailable and clinically researched form of vitamin C — this obagi professional c serum delivers visible brightening, dark spot reduction, and fine line improvement through consistent daily morning use.

At a dermatologist-approved pH level, the formula ensures optimal absorption and efficacy while remaining gentle enough for daily use on sensitive skin. The lightweight, fast-absorbing texture layers seamlessly under moisturizer and SPF — making it the ideal foundation for a complete anti-aging morning routine. Backed by Obagi's decades of clinical expertise and part of the award-winning Professional-C line recognized by Allure and Oprah Daily.

Key Benefits

• 20% pure L-Ascorbic Acid — ideal starting concentration for sensitive and combination skin
• Visibly brightens skin tone and improves overall radiance with consistent use
• Reduces the appearance of dark spots, sun damage, and hyperpigmentation
• Supports natural collagen production to reduce fine lines and wrinkles
• Neutralizes free radicals from UV, blue light, and infrared radiation
• Ferulic acid-free — suitable for rosacea-prone skin sensitive to ferulic acid
• Lightweight, fast-absorbing formula — no greasy or heavy residue
• Gentle enough for daily use — minimal tingling compared to higher concentrations
• Dermatologist-recommended as a first-step vitamin C serum
• Protected in dark amber glass bottle to preserve L-Ascorbic Acid stability

Key Ingredients

• 20% L-Ascorbic Acid (Pure Vitamin C): The gold standard form of vitamin C — brightens skin tone, reduces hyperpigmentation, stimulates collagen production, and provides powerful antioxidant protection against environmental stressors
• Ascorbyl Glucoside (Vitamin C Derivative): A stable, gentle vitamin C derivative that delivers complementary brightening and antioxidant benefits alongside L-Ascorbic Acid
• Propylene Glycol: A humectant that draws moisture into the skin and supports even distribution of active ingredients
• Ethoxydiglycol: A penetration enhancer that improves the absorption of L-Ascorbic Acid into the deeper layers of skin for maximum efficacy
• Citrus Aurantium Dulcis (Orange) Peel Extract: A natural brightening botanical rich in antioxidants that supports an even, radiant complexion
• Citrus Paradisi (Grapefruit) Fruit Extract: Provides additional antioxidant support and a light, refreshing natural fragrance

• Use every morning after cleansing and toning on clean, dry skin
• Dispense 4–6 drops into clean fingertips or palm
• Apply evenly to face and neck using upward, outward motions
• Allow 1–2 minutes to fully absorb before applying moisturizer and SPF
• Always follow with broad-spectrum sunscreen in the morning
• New to vitamin C: start every other day for the first 1–2 weeks, then increase to daily use
• Mild tingling upon first application is normal and typically subsides with continued use
• Store in a cool, dark place — refrigeration helps extend product stability
• Serum may naturally darken slightly over time — light amber color is normal and does not affect efficacy
• Discard if serum turns dark orange or brown — a sign of significant oxidation

Full Ingredient List: Propylene Glycol, Aqua/Water/Eau, Ascorbic Acid, Alcohol Denat., Ascorbyl Glucoside, Citrus Aurantium Dulcis (Orange) Peel Extract, Citrus Paradisi (Grapefruit) Fruit Extract, Caprylyl/Capryl Glucoside, Fragrance (Parfum), Citric Acid, Benzyl Benzoate, Amyl Cinnamal, Limonene, Hexyl Cinnamal.

Note: This formula does not contain Ferulic Acid or Vitamin E — making it a preferred choice for users with rosacea or ferulic acid sensitivity. Please refer to product packaging for the most accurate and up-to-date ingredient list.

• BrandObagi Medical
• Product TypeMedical Grade Vitamin C Antioxidant Serum
• Volume1 fl. oz / 30ml
• Vitamin C Concentration20% L-Ascorbic Acid
• Ferulic AcidFerulic Acid-Free
• FragranceLight Natural Citrus Fragrance
• Usage TimeMorning
• Skin TypeSensitive, Combination, Normal
• Best ForFirst-Time Vitamin C Users, Sensitive Skin
• PackagingDark Amber Glass Bottle with Dropper

Skin Type: Sensitive SkinCombination SkinNormal Skin

Skin Concern: Dark SpotsHyperpigmentationUneven Skin ToneFine Lines and WrinklesDullnessFree Radical DamageSun DamageLoss of RadianceRednessPremature Aging