Professional-C Serum 20%
Professional-C Serum 20%
Product Description
Obagi Professional-C Serum 20%
A medical-grade vitamin C serum with 20% L-Ascorbic Acid to brighten, protect, and reduce signs of aging for normal to oily skin types.
π Quick Info
β¨ Key Benefits
Powerful Brightening
20% L-Ascorbic Acid fades dark spots and hyperpigmentation for a more even, luminous complexion. 91% of users reported brighter skin.
Antioxidant Protection
Neutralizes free radicals from UV rays, blue light, infrared radiation, and pollution that cause premature aging and skin damage.
Collagen Boost
Stimulates natural collagen production to improve skin firmness, elasticity, and reduce the appearance of fine lines and wrinkles.
Hydration Support
Contains Sodium Hyaluronate (hyaluronic acid) to attract and retain moisture, keeping skin plump and hydrated throughout the day.
Fast Absorption
Lightweight, oil-free formula absorbs quickly without leaving greasy residue. Perfect for layering under moisturizer and sunscreen.
Medical-Grade Formula
Developed following the Duke Antioxidant Patent guidelines with optimal pH (2.0-2.4) for maximum penetration and efficacy.
π‘οΈ Safety Profile
Vitamin C (L-Ascorbic Acid) is considered safe for use during pregnancy and breastfeeding. This formula contains no retinoids, salicylic acid, hydroquinone, or chemical sunscreens. Always consult your healthcare provider for personalized advice.
This formula does not contain fatty acids, esters, polysorbates, or fermented ingredients that feed Malassezia yeast. Safe for those prone to fungal acne or pityrosporum folliculitis.
Oil-free, lightweight formula that won't clog pores. Suitable for acne-prone skin types. Low comedogenic rating ensures minimal risk of breakouts.
This formula contains denatured alcohol which may cause dryness in sensitive skin. Also includes fragrance which some individuals may find irritating. Patch test recommended for sensitive skin.
Some users may experience a slight tingling sensation upon application, which typically diminishes with continued use. If severe irritation occurs, discontinue use and consult a dermatologist.
π§ͺ Key Ingredients Analysis
π L-Ascorbic Acid 20% Gold Standard
The purest and most potent form of Vitamin C. At 20% concentration, this is the highest effective dose for maximum antioxidant protection and brightening without excessive irritation.
- Function: Antioxidant, collagen synthesis, melanin inhibition, photoprotection
- Research: Duke Antioxidant studies confirm 10-20% concentration with pH 2.0-3.0 is optimal for skin penetration
- Stability: Most effective but requires proper storage; color change to orange/brown indicates oxidation
π§ Sodium Hyaluronate Hydrating Proven
A salt form of hyaluronic acid with smaller molecular weight, allowing deeper penetration into the skin for enhanced hydration from within.
- Function: Humectant that holds up to 1000x its weight in water
- Benefits: Plumps skin, reduces fine lines, improves skin texture and moisture retention
- Synergy: Works synergistically with vitamin C to prevent dryness that high-potency L-AA can cause
π Ascorbyl Glucoside Stabilized C Promising
A stable, water-soluble derivative of vitamin C that converts to L-Ascorbic Acid once absorbed into the skin, providing additional brightening benefits.
- Function: More stable vitamin C derivative that extends product shelf life
- Conversion: Metabolized by skin enzymes into active L-Ascorbic Acid
- Benefits: Brightening, antioxidant protection, supports overall vitamin C efficacy
π Full Ingredients List
Propylene Glycol, Water (Aqua), L-Ascorbic Acid, Alcohol, Ascorbyl Glucoside, Ethoxydiglycol, Phenoxyethanol, Sorbitol, Sodium Hyaluronate, Zinc Chloride, Calcium Hydroxide, Fragrance
β Free From
π Where It Goes In Your Routine
π How to Use
Cleanse & Dry
Start with freshly cleansed, completely dry skin. Apply after toner if you use one. Ensure face is dry as water can dilute the serum's efficacy.
Apply 5-7 Drops
Dispense 5-7 drops onto your fingertips. Gently pat and press onto face, neck, and dΓ©colletage. Avoid the eye area and lips.
Wait & Absorb
Allow 30 seconds to 1 minute for full absorption before applying next products. The serum should feel dry to the touch.
Moisturize & Protect
Follow with your moisturizer. In the morning, always finish with broad-spectrum SPF 30+ sunscreen. Vitamin C enhances sun protection.
π€ Skin Type Compatibility
Oil-free, lightweight formula absorbs instantly without adding shine. Formulated specifically for normal to oily skin types.
Balances well across different face zones. Non-greasy formula works on oily T-zone without over-drying cheeks.
Ideal match for normal skin. Delivers powerful antioxidant benefits and brightening without disrupting skin balance.
Contains hyaluronic acid for hydration, but the 15% formula may be gentler for dry skin. Layer with a rich moisturizer.
20% L-Ascorbic Acid may cause irritation. Contains alcohol and fragrance. Consider 10% or 15% versions instead. Patch test first.
Non-comedogenic, oil-free, and fungal acne safe. Helps fade post-acne hyperpigmentation and dark marks.
π Expected Results Timeline
Initial Adjustment
Skin adjusts to the potent formula. Some may experience mild tingling that subsides with continued use. Immediate radiance boost after application.
91% noticed improved brightness and hydrationVisible Brightening
Noticeable improvement in overall skin tone and radiance. Skin appears more luminous and even. Dark spots begin to fade.
85% reported improved skin textureDark Spot Reduction
Significant fading of hyperpigmentation, sun spots, and post-acne marks. Fine lines appear softer. Improved firmness becoming apparent.
80% noticed reduced dark spotsAnti-Aging Benefits
Visible reduction in fine lines and wrinkles. Collagen stimulation effects become noticeable. Skin appears plumper and more youthful.
75% reported reduced fine linesOptimal Results
Full benefits realized with consistent daily use. Comprehensive improvement in skin tone, texture, firmness, and overall radiance. Continued protection from environmental damage.
Best results with continued useβ Real Reviews Across Platforms
π¬ What Users Love
- Visible brightening within weeks - "My skin has never looked better"
- Effective at fading melasma and dark spots
- Lightweight, fast-absorbing, non-greasy texture
- 10+ year loyal users who won't switch to anything else
- Works well with other Obagi products and retinoids
- Gives skin a healthy, radiant glow
π° Budget-Friendly Alternatives
Similar 20% L-Ascorbic Acid concentration plus Vitamin E and Ferulic Acid for enhanced stability. Passes accelerated stability tests. Glass airless pump packaging.
Same 20% L-Ascorbic Acid with Vitamin E, Ferulic Acid, and Hyaluronic Acid. Nearly identical formulation to SkinCeuticals at a fraction of the price.
15% L-Ascorbic Acid with Vitamin E, Ferulic Acid, and botanical blend. Slightly lower concentration but excellent for vitamin C beginners.
βοΈ Compare With Competitors
Obagi Professional-C 20%
$150.00SkinCeuticals C E Ferulic
$182.00Timeless 20% C + E + Ferulic
$28.00β Frequently Asked Questions
Yes, vitamin C (L-Ascorbic Acid) is generally considered safe for use during pregnancy and breastfeeding. This formula does not contain retinoids, high-concentration salicylic acid, hydroquinone, or chemical sunscreens that should be avoided during pregnancy. However, always consult with your healthcare provider before starting any new skincare products during pregnancy or while nursing.
Yes, this serum is fungal acne safe. The formula does not contain fatty acids, fatty esters, polysorbates, or fermented ingredients that feed Malassezia yeast. It's oil-free and non-comedogenic, making it suitable for those prone to fungal acne or pityrosporum folliculitis.
Yes, but use caution when combining potent actives. Vitamin C works well with retinol - use vitamin C in the morning and retinol at night. Avoid using with benzoyl peroxide as it can deactivate vitamin C. AHA/BHA can be used but may increase irritation - consider alternating days or applying at different times. Always introduce one active at a time and monitor skin tolerance.
This serum is specifically formulated for normal to oily skin types. The lightweight, oil-free formula absorbs quickly without greasiness. Those with dry or sensitive skin may prefer the 10% or 15% versions, which are gentler. Combination and acne-prone skin types also benefit from this non-comedogenic formula.
Most users notice improved brightness and hydration within the first week. Visible improvement in skin tone and radiance typically occurs within 2-4 weeks. Significant fading of dark spots and hyperpigmentation usually takes 4-8 weeks. Anti-aging benefits like reduced fine lines become noticeable after 8-12 weeks of consistent daily use.
Apply after cleansing and toning, on completely dry skin. This serum should be applied before heavier products like moisturizers and oils. In the morning, apply serum β moisturizer β sunscreen. In the evening, apply serum β treatments (like retinol) β moisturizer. Wait 30 seconds to 1 minute for full absorption before the next step.
No, this serum is non-comedogenic and oil-free with a comedogenic rating of 1/5 (very low). It will not clog pores and is suitable for acne-prone skin. The lightweight formula absorbs quickly without leaving residue that could block pores. It's also fungal acne safe.
Obagi recommends using the serum within 6-12 months after opening for optimal potency. Unopened, it has a 2-year shelf life. Store in a cool, dark place (refrigeration is optional but can extend freshness). If the serum turns dark orange or brown, it has oxidized and should be replaced. Normal color ranges from clear to light amber.
Normal color variation ranges from clear to light yellow/amber. This is natural and doesn't affect efficacy. However, if the serum turns dark orange or brown, it has oxidized and lost potency - time to replace it. To prevent oxidation, store away from direct sunlight and heat, close the cap tightly after use, and consider refrigeration.
Yes, mild tingling is normal, especially when first starting the product or if you have sensitive skin. This typically diminishes with continued use as your skin adjusts. However, if you experience severe stinging, burning, redness, or irritation, discontinue use and consult a dermatologist. Consider starting with the 10% or 15% formulations if 20% is too intense.
A medical-grade vitamin C powerhouse backed by 30+ years of dermatological research. The 20% L-Ascorbic Acid concentration delivers proven brightening, anti-aging, and antioxidant benefits. Best suited for normal to oily skin types seeking visible results. Premium price point, but the efficacy and brand reputation justify the investment for those serious about their skincare.
Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging Β«promisesΒ» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 3 |
Propylene Glycol
Solvent, Skin Conditioning, Fragrance, Humectant, Viscosity Controlling, Viscosity Decreasing Agent, Skin-Conditioningagent - Miscellaneous
|
Hydrating
|
|
| 1 |
Ascorbic Acid
Skin Conditioning, Masking, Fragrance, Antioxidant, Ph Adjuster, Buffering Agent, Buffering
|
Promotes Wound Healing
Redness
Dark Spots
Texture
Pores
|
|
| 0 |
Alcohol
Antimicrobial, Astringent, Masking, Solvent
|
|
|
| 1 |
Ascorbyl Glucoside
Antioxidant
|
Redness
Texture
Pores
|
|
| 1 |
Ethoxydiglycol
Solvent, Perfuming, Fragrance, Humectant, Viscosity Decreasing Agent
|
|

