Obagi Professional-C® Serum 20% is the highest-strength vitamin C serum in the Professional-C range. Formulated with 20% pure L-ascorbic acid, it helps brighten the complexion, improve the appearance of fine lines and defend against environmental damage while supporting healthier-looking skin.
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Daily exposure to UV light, pollution and environmental stress generates free radicals that contribute to premature skin ageing. A high-quality antioxidant serum helps defend against this damage while supporting brighter, healthier-looking skin.
Obagi Professional-C® Serum 20% contains the highest concentration of pure L-ascorbic acid in the Professional-C range. Developed for normal, combination and oily skin, it provides intensive antioxidant protection while helping improve the appearance of fine lines, uneven skin tone and dullness.
Its lightweight, fast-absorbing formula penetrates deeply into the skin without leaving a greasy finish, making it ideal for those seeking the strongest vitamin C formulation in the Obagi range.
Contains 20% pure L-ascorbic acid
Helps brighten dull skin
Improves the appearance of uneven skin tone
Helps reduce the appearance of fine lines and wrinkles
Provides powerful antioxidant protection against environmental damage
Supports collagen production
Fast-absorbing, lightweight formula
Suitable for normal, combination and oily skin
At Dr Ed Robinson Clinics, we believe skincare should be tailored to both your skin type and your experience with active ingredients.
Professional-C® Serum 20% is ideal for patients who already tolerate vitamin C well and want the highest concentration available within the range. It provides advanced antioxidant protection while supporting brighter, firmer and healthier-looking skin, making it an excellent addition to a results-driven skincare routine or alongside professional aesthetic treatments.
20% L-Ascorbic Acid
The purest and most biologically active form of vitamin C. Helps defend against free radical damage while improving the appearance of fine lines, uneven skin tone and skin radiance.
Ascorbyl Glucoside
A stable vitamin C derivative that complements pure L-ascorbic acid and provides additional antioxidant support.
Sodium Hyaluronate
A form of hyaluronic acid that attracts moisture to the skin, helping maintain hydration while using a high-strength vitamin C serum.
Propylene Glycol
Supports hydration and enhances the delivery of active ingredients into the skin.
Ideal for anyone with:
Normal skin
Combination skin
Oily skin
Dull complexion
Uneven skin tone
Fine lines and wrinkles
Environmental skin damage
Skin already accustomed to higher-strength vitamin C
Apply 5–7 drops to clean, dry skin every morning after cleansing.
Massage evenly over the face, neck and décolletage before applying moisturiser and broad spectrum SPF. Allow the serum to absorb fully before applying makeup.
Store in a cool, dark place and replace the cap immediately after use to help maintain the stability of the vitamin C.
Higher strength doesn't always mean better. The 20% formulation is best suited to skin that is already comfortable with vitamin C. If you're new to antioxidant serums or have sensitive skin, we would usually recommend starting with the 10% or 15% formulation before progressing to the highest concentration.
More more general enquiries, please take a look at some of our frequently asked questions.
It's ideal for normal, combination and oily skin, particularly for patients already accustomed to vitamin C who want the highest concentration in the Professional-C range.
The main difference is the concentration of pure L-ascorbic acid. The 10% serum is best for sensitive skin, the 15% formulation suits most normal skin types, while the 20% serum provides the highest-strength antioxidant protection for experienced users.
Yes. Professional-C® Serum 20% is designed for daily morning use as part of your skincare routine.
Absolutely. Vitamin C complements sunscreen by helping defend against free radical damage, but it doesn't replace SPF. Daily sun protection remains essential.
Yes. Many people use vitamin C in the morning and retinol in the evening, allowing both ingredients to work effectively within the same skincare routine
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