OBAGI - Professional-C® Serum 15%

Obagi Professional-C Serum 15%: High-Performance Daily Vitamin C

Obagi Professional-C® Serum 15% is a concentrated antioxidant facial serum formulated with 15% pure L-ascorbic acid. It helps brighten and even the complexion, reinforce antioxidant defences and improve the appearance of fine lines and wrinkles.

Positioned between the introductory 10% serum and maximum-strength 20% formulation, Professional-C 15% provides a powerful and versatile daily vitamin C treatment for normal-to-combination skin. It is particularly suited to established vitamin C users seeking more intensive brightening, smoothing and environmental protection without moving directly to the highest concentration.

The fast-absorbing formula delivers active vitamin C directly within a lightweight serum step, making it easy to layer beneath moisturiser, sunscreen and makeup.

What Does Obagi Professional-C Serum 15% Do?

• Provides a concentrated 15% level of pure L-ascorbic acid.
• Brightens dull, tired and lacklustre skin.
• Promotes a clearer and more even-looking complexion.
• Helps improve the appearance of dark spots and visible discolouration.
• Smooths the appearance of fine lines and wrinkles.
• Supports firmer and more youthful-looking skin.
• Helps neutralise environmentally generated free radicals.
• Strengthens the skin’s daily antioxidant defences.
• Absorbs quickly without leaving a heavy finish.

15% Pure L-Ascorbic Acid

L-ascorbic acid is the pure and biologically active form of vitamin C. It is recognised for its ability to combine antioxidant protection, visible brightening and support against several signs of skin ageing within one ingredient.

At a 15% concentration, Professional-C Serum delivers a substantial daily dose of L-ascorbic acid while retaining a versatile position within the three-strength Obagi range.

Antioxidant Protection

Ultraviolet exposure, pollution and other environmental influences can generate free radicals that contribute to dullness, uneven tone, fine lines and reduced skin resilience.

Professional-C Serum 15% helps neutralise free radicals and strengthen the complexion’s antioxidant defences. This makes it especially valuable as part of a morning routine designed to protect the visible quality of the skin throughout the day.

Brighter, More Even-Looking Tone

Pure vitamin C helps improve the appearance of dullness, dark spots and uneven pigmentation. With consistent use, Professional-C 15% supports a brighter, clearer and more luminous-looking complexion.

The concentrated formula is particularly relevant where environmental exposure, accumulated sun damage or natural ageing has reduced the skin’s radiance and uniformity.

Fine Lines, Wrinkles and Firmness

L-ascorbic acid supports the biological processes associated with healthy collagen. Professional-C Serum 15% helps improve the visible appearance of fine lines, wrinkles, firmness and surface smoothness while supporting a more youthful-looking complexion.

The Versatile Strength in the Professional-C Range

Professional-C 15% occupies the central position within Obagi’s three-strength vitamin C system. It offers more concentrated L-ascorbic acid than the 10% introductory formula while remaining a versatile choice for normal-to-combination skin.

This makes it particularly appropriate for:

• Established users of vitamin C skincare.
• Normal and combination skin types.
• Skin requiring stronger brightening and antioxidant support.
• Visible dullness and uneven-looking tone.
• Fine lines and early-to-moderate signs of photo-ageing.
• Users progressing from a lower vitamin C concentration.
• Anyone seeking a high-performance daily serum below the maximum 20% strength.

Choosing Between Professional-C 10%, 15% and 20%

Each Professional-C concentration has a clearly defined position:

• Obagi Professional-C Serum 10% is the introductory strength for dry, sensitive or vitamin C-naive skin.
• Obagi Professional-C Serum 15% is the versatile intermediate strength for normal-to-combination skin and established users.
• Obagi Professional-C Serum 20% is the maximum-strength formulation for normal-to-oily, combination and experienced skin.

The 15% serum is an excellent central option when the objective is concentrated brightening, antioxidant defence and visible age support within a balanced everyday formula.

Read our complete Obagi Professional-C Serum 10%, 15% and 20% guide for a detailed explanation of the three strengths.

How to Use Obagi Professional-C Serum 15%

1. Cleanse and tone the face.
2. Allow the skin to dry before applying the serum.
3. Dispense approximately five to seven drops onto the fingertips.
4. Apply evenly across the face, neck and upper chest.
5. Allow the serum to absorb before applying additional skincare.
6. Follow with moisturiser where required.
7. Complete the morning routine with broad-spectrum sunscreen.

Use once daily, preferably in the morning. Anyone moving from the 10% concentration can introduce the 15% serum progressively before establishing consistent daily application.

Building an Obagi Morning Routine

Professional-C Serum 15% should be applied after cleansing and toning but before heavier serums, moisturiser and SPF.

A complete morning order may include:

1. Obagi cleanser.
2. Obagi toner, when used.
3. Professional-C Serum 15%.
4. Additional targeted serum, when required.
5. Obagi Hydrate Facial Moisturiser.
6. Broad-spectrum sunscreen.

Where dehydration accompanies dullness or uneven tone, Obagi Daily Hydro-Drops Facial Serum can be layered after Professional-C Serum has absorbed. This combines concentrated antioxidant support with a dedicated hydration step.

Professional-C Serum and Daily Sunscreen

Vitamin C and sunscreen create complementary daytime protection. Professional-C Serum helps neutralise free radicals generated by environmental exposure, while sunscreen provides a separate layer of ultraviolet protection.

Using Professional-C Serum 15% beneath broad-spectrum SPF supports a more comprehensive morning strategy for brightness, even tone and the visible effects of photo-ageing.

Using Professional-C Serum with Retinol

Vitamin C and retinol can be used within the same overall skincare programme because they perform complementary roles.

A straightforward routine places Professional-C Serum 15% in the morning and retinol in the evening. This gives the vitamin C serum a clear daytime antioxidant role while reserving the evening routine for vitamin A and renewal-focused skincare.

Formula Stability and Storage

Pure L-ascorbic acid is naturally sensitive to prolonged exposure to heat, light and air. Correct storage helps maintain the condition of the serum after opening.

• Keep the cap tightly closed between applications.
• Store the bottle in a cool, dark and dry location.
• Keep it away from direct sunlight and excessive heat.
• Avoid touching the dropper directly to the face.
• Use the serum within three to six months of opening.

Obagi vitamin C serums can naturally range from clear to amber because of the character of the antioxidant formula.

Frequently Asked Questions

What percentage of vitamin C is in Professional-C Serum 15%?

It contains 15% L-ascorbic acid, the pure and biologically active form of vitamin C used for antioxidant protection, visible brightening and age-supporting skincare.

Who should use Obagi Professional-C 15%?

It is particularly suited to normal-to-combination skin, established vitamin C users and people seeking concentrated support for dullness, uneven tone, dark spots, fine lines and environmental ageing.

Is Professional-C 15% stronger than the 10% serum?

Yes. It contains a higher concentration of L-ascorbic acid and provides the intermediate strength within the range. It is a natural progression for users who have established good tolerance to Professional-C 10%.

Should I choose Professional-C 15% or 20%?

Professional-C 15% is the versatile intermediate strength for normal-to-combination skin. Professional-C 20% provides Obagi’s maximum L-ascorbic acid concentration and is positioned primarily for normal-to-oily, combination and experienced skin.

Can Professional-C 15% help with dark spots?

Yes. Pure L-ascorbic acid helps improve the appearance of dark spots, uneven pigmentation and dullness while promoting a clearer and more luminous-looking complexion.

Does it help with fine lines and wrinkles?

Yes. L-ascorbic acid supports the biological processes associated with healthy collagen, helping improve the visible appearance of fine lines, wrinkles, firmness and skin smoothness.

Can I use it every day?

Yes. Professional-C Serum 15% is formulated as a daily antioxidant treatment. Users moving from a lower concentration can build towards consistent daily application.

Is it better to use vitamin C in the morning?

Morning use allows its antioxidant activity to complement sunscreen and support the skin against environmental exposure throughout the day.

Can it be worn underneath makeup?

Yes. Its lightweight, fast-absorbing consistency layers readily beneath moisturiser, sunscreen and makeup.

Why can vitamin C serum tingle?

A brief tingling sensation can occur when applying concentrated L-ascorbic acid, especially when first moving to a stronger formulation. Severe or persistent discomfort is a reason to discontinue application and seek appropriate advice.

Product Details

• Product: Obagi Professional-C® Serum 15%
• Size: 30ml
• Vitamin C: 15% L-ascorbic acid
• Format: Lightweight antioxidant facial serum
• Skin types: Normal-to-combination skin
• Use: Once daily, preferably in the morning
• Primary concerns: Dullness, dark spots, uneven tone, fine lines, wrinkles and environmental ageing

Important Information

For external use only. Avoid direct contact with the eyes, nose, mouth and lips. A temporary mild tingling sensation can occur. Discontinue use and seek appropriate advice if tingling becomes severe or irritation persists.

Product formulations and ingredient declarations can be updated. Always check the ingredient list printed on the product supplied before use, particularly if you have known allergies or sensitivities.

Related vitamin C products and information

• Obagi Professional-C Serum 10%, 15% and 20% guide
• Obagi Professional-C Serum 10%
• Obagi Professional-C Serum 20%
• How to layer serums, moisturiser and sunscreen
• Explore the Obagi Medical skincare range

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