Allure Best of Beauty Award Seal 2025
20% VITAMIN C ANTIOXIDANT SERUM
20% VITAMIN C ANTIOXIDANT SERUM
20% VITAMIN C ANTIOXIDANT SERUM
20% VITAMIN C ANTIOXIDANT SERUM
20% VITAMIN C ANTIOXIDANT SERUM
20% VITAMIN C ANTIOXIDANT SERUM
BESTSELLER
4.6
Rated 4.6 out of 5 stars
246 Reviews
PROFESSIONAL-C® ,

20% VITAMIN C ANTIOXIDANT SERUM

Vitamin C Serum For Normal to Oily Skin

$155.00
Size
20% VITAMIN C ANTIOXIDANT SERUM

20% VITAMIN C ANTIOXIDANT SERUM
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Best for
Skin Discoloration - color
Skin Discoloration
Skin Types: Normal to OilyCombination

Discover Obagi’s bestselling Professional C® Serum 20%, formulated with L-Ascorbic Acid and Sodium Hyaluronate. Fast-absorbing serum helps to brighten and even skin tone, reduce the appearance of dark spots, strengthen antioxidant defenses, and improve the appearance of fine lines and wrinkles. For a supercharged, hydrated glow and more youthful-looking skin. Ideal for normal to oily skin types.

  • 91% of users reported skin appeared bright and more hydrated*
  • Combats oxidative stress induced by blue light and infrared radiation** that cause early signs of skin aging
  • Formulated with L-Ascorbic Acid to brighten skin
  • Helps to neutralize free radicals

*Obagi survey analysis, Vitamin C products: April 28, 2010. Data on file at Obagi Cosmeceuticals LLC.

**2023 In-Vitro Antioxidant Potential Assay. Data on file at Obagi Cosmeceuticals LLC.

Best of Beauty - SKIN - Best Antioxidant Facial Serum by Allure, 2025

Editor's Choice Awards - Dermatologist Favorite Vitamin-C Serum by Oprah Daily, 2025

    How To Use

    • Step 1: Apply 5-7 drops in the morning after cleansing and toning, before moisturizer.
    • Step 2: Follow-up with SPF before makeup application.
    • Note: Use within 3-6 months of first opening.


    Storage

    • Store at controlled and consistent humidity and temperature not exceeding 25°C (77°F).
    • Keep out of direct sunlight.
    • Store in a dark, cool place after opening.
    • Keep cap on tightly when not in use.

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    • Product description
      Discover Obagi’s bestselling Professional C® Serum 20%, formulated with L-Ascorbic Acid and Sodium Hyaluronate. Fast-absorbing serum helps to brighten and even skin tone, reduce the appearance of d...
      Professional C® Serum 10% is formulated with L-Ascorbic Acid to help brighten and even skin tone, strengthen skin's antioxidant defenses and improve the appearance of fine lines and wrinkles withou...
      The Obagi-C Fx C-Clarifying Serum combines Vitamin C and Arbutin to enhance the appearance of even skin tone for a healthier-looking complexion.
    • Best for
      Skin Discoloration - color
      Skin Discoloration
      Skin Discoloration - color
      Skin Discoloration
      Sensitive Skin - color
      Sensitive Skin
      Skin Discoloration - color
      Skin Discoloration
      Skin Types
      Normal to OilyCombination
      Normal to DryCombination
      Normal to OilyNormal to DryCombination
    4.6
    Rated 4.6 out of 5 stars
    Based on 246 reviews
    Reviews Summary
    Customers say this serum applies smoothly and absorbs quickly without leaving skin greasy. Many report immediate brightening effects and a noticeable glow that lasts throughout the day. Users frequently mention improvements in skin tone evenness, with several noting reduced appearance of dark spots and fine lines over time. The lightweight texture and pleasant scent are commonly praised. Some customers mention it can be slightly drying, particularly when switching from lower concentrations. A few users note concerns about product consistency between bottles, with some receiving clearer formulations than expected. Despite the higher price point, most find the results justify the cost and consider it a skincare staple.
    Write a Review (Opens in a new window)
    246 reviews
    • Marianne W.
      FL, United States
      Verified Buyer
      I recommend this product
      Age 55-64
      Gender Female
      Rated 5 out of 5 stars
      August 4, 2026
      High performance product

      The 20% C Serum is in my cycle of products I’ve used on and off for 10+ years. I like to change things up, the same way one does with a physical exercise program.

      EffectivenessRated 4.0 on a scale of 1 to 5
      Was this helpful?
    • Carol
      I recommend this product
      Rated 5 out of 5 stars
      August 3, 2026
      5 Stars

      The Best vitamin C serum on the market!

      Was this helpful?
    • Stacey
      I recommend this product
      Rated 5 out of 5 stars
      July 23, 2026
      5 Stars

      Best way to get a glow.

      Was this helpful?
    • THU T. L.
      CA, United States
      Verified Buyer
      I recommend this product
      Age 35-44
      Gender Female
      Rated 5 out of 5 stars
      July 19, 2026
      good

      Good

      EffectivenessRated 5.0 on a scale of 1 to 5
      Was this helpful?
    • Carolina
      I recommend this product
      Rated 5 out of 5 stars
      July 17, 2026
      5 Stars

      Simply the best.

      Was this helpful?
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