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Obagi Professional C Serum 20%

Obagi Professional C Serum 20%

4.7· 2,700 ratings

Best price now

$18.00at eBayObserved at 11:42 AM

70% under what the other stores charge

Compared across 3 stores. Prices are checked against each store and labelled with when.

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Our take on the Obagi Professional C Serum 20%

Obagi Professional-C Serum 20% is a high-strength vitamin C serum built around 20% L-ascorbic acid, with hyaluronic acid and aloe to soften the formula. It targets hyperpigmentation, dullness and early signs of aging, and is aimed at oily skin. The best new price is $12.50 at eBay as of November 5, 2026, with three stores listing it new.

Best forOily and combination skinFading dark spots and post-acne marksBrightening dull, uneven toneExperienced vitamin C users wanting a high percentage
Pros
  • 20% L-ascorbic acid is a clinically studied strength for brightening
  • Hyaluronic acid and aloe add hydration and reduce tightness
  • Lightweight serum texture suits oily skin
  • Targets both hyperpigmentation and fine lines
  • FSA/HSA eligible
Cons
  • 20% vitamin C can sting sensitive or broken skin
  • L-ascorbic acid oxidizes and turns yellow-brown over time
  • Needs daily sunscreen use to protect results
  • Not ideal for dry or reactive skin types

Obagi Professional C Serum 20% prices at every store

  • eBayNew

    In stock

    $18.00Observed at 11:42 AM
    Visit store
  • WalmartNew

    In stockSold by marvelfare.com

    $59.99Observed at 11:42 AM
    Visit store
  • ShopSimonNew

    In stock

    $103.24Observed at 11:42 AM
    Visit store

Also available at

  • eBayCheck price at eBay
  • AYA SkinCheck price at AYA Skin
  • DermSilk.comCheck price at DermSilk.com
  • eCosmeticsCheck price at eCosmetics
  • Editors PickCheck price at Editors Pick
  • Jomashop.comCheck price at Jomashop.com
  • LovelySkin.comCheck price at LovelySkin.com
  • ObagiCheck price at Obagi
  • SkincareEssentialsCheck price at SkincareEssentials
  • Skin EliteCheck price at Skin Elite
  • The Look & Co.Check price at The Look & Co.

Obagi Professional C Serum 20% price history

Lowest price we've seen: $18.00 on Nov 5 at eBay. Tracked across 13 stores since Nov 5.

What reviewers say

  • 4.7 / 52,700 ratings

With 4.7 out of 5 from about 2,700 ratings, buyers mostly report brighter, more even skin and fading of dark spots over several weeks. Complaints center on stinging and on bottles darkening before they are finished.

What people mention
  • BrighteningPraisedUsers say dark spots and overall tone look more even after consistent use.
  • TexturePraisedThe serum absorbs quickly and layers well under moisturizer and sunscreen.
  • IrritationCriticisedSome buyers report stinging, redness or dryness, especially at first.
  • OxidationCriticisedOwners complain the liquid darkens to yellow or brown before the bottle is used up.
  • ValueMixedBuyers like the results but find the price per ounce steep.

Specifications

Ingredient
Aloe, Vitamin C, Hyaluronic Acid
Skin Type
For Oily Skin
Form
Serum
Skin Problem
Hyperpigmentation, Wrinkles
Key ingredients
L-ascorbic acid

Questions and answers

Is 20% vitamin C too strong for beginners?
It is on the high end. Start every other morning and buffer with moisturizer if your skin stings. Sensitive skin may do better with a 10% formula.
How does it compare to Obagi's 10% and 15% serums?
The 20% is the strongest of the line and best for stubborn pigmentation and oily skin. The lower strengths suit sensitive or first-time vitamin C users.
Why did my serum turn yellow or brown?
L-ascorbic acid oxidizes when exposed to air and light. Keep the bottle capped and stored away from sunlight; discard it if it turns dark brown.
Can I use it with retinol or niacinamide?
Yes, but apply vitamin C in the morning and retinol at night to limit irritation. Niacinamide layers fine with it.
What is in the bottle?
A 1 fl oz serum with 20% L-ascorbic acid, hyaluronic acid and aloe. No sunscreen is included, so pair it with SPF.
When is the price lowest?
The best new price was $12.50 at eBay as of November 5, 2026. Watch for multi-bottle sets and seasonal sales, which lower the per-ounce cost.
Where is the Obagi Professional C Serum 20% cheapest?
At eBay, for $18.00, 70% under what the other stores charge, as of our latest check.
What do buyers say about the Obagi Professional C Serum 20%?
Rated 4.7 out of 5 from 2,700 ratings.
Where can I buy the Obagi Professional C Serum 20%?
13 stores we checked sell it, including ShopSimon, eBay, Walmart, AYA Skin, DermSilk.com.

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