Obagi Medical Professional-C Vitamin C Serum 20% — 0.42 oz, High-Purity L‑Ascorbic Acid for Brightening & Fine Line Reduction

Obagi Professional-C 20% Vitamin C Serum is a high-concentration L‑ascorbic acid treatment designed to help brighten skin tone and reduce the visible signs of aging.

This 0.42 oz serum from Obagi Medical delivers a laboratory-formulated dose of pure vitamin C (L‑ascorbic acid) at a pH designed to maximize stability and skin absorption. Developed for use in both medical and at-home routines, the formula targets uneven tone, dullness, and the appearance of fine lines while supporting the skin’s natural defenses against daily environmental stressors. It pairs well with moisturizers and sunscreen to help maintain results.

How does a 20% vitamin C concentration improve my skin's appearance?

A 20% strength of L‑ascorbic acid provides potent antioxidant activity and is intended to deliver visible brightening effects more quickly than lower concentrations. The formula’s pH and purity are optimized to improve penetration so active vitamin C reaches the skin layers where it can support tone and radiance.

• High-purity L‑ascorbic acid at clinically relevant concentration.
• pH-balanced to support ingredient stability and skin uptake.
• Targets visible dullness and uneven tone for brighter-looking skin.

Will this serum help with fine lines and texture?

The serum is formulated to reduce the visible appearance of fine lines and improve skin texture by supporting collagen-related pathways and skin surface renewal. While individual results vary, many users notice smoother-looking skin and improved radiance with consistent use.

• Supports appearance of firmer, smoother skin over time.
• Helps minimize the look of expression lines and surface roughness.
• Recommended as part of a daily regimen for cumulative benefits.

How should I incorporate this serum into my daily skincare routine?

Apply a few drops to clean, dry skin in the morning or evening, followed by a moisturizer. Because vitamin C can increase sun sensitivity while it brightens and renews, pairing with a broad-spectrum sunscreen during daytime use is advised.

• Use 3–4 drops on face and neck after cleansing, before moisturizer.
• Allow absorption for a minute, then follow with SPF in the morning.
• Start with alternate-day use if you have sensitive skin, then build to daily application.

Is this serum clinically tested and suitable for different skin types?

Obagi formulates and tests its products in clinical settings, with consumer studies showing high satisfaction for brightness and hydration. The product is dermatologist tested and positioned for a range of skin types, though those with very reactive skin should perform a patch test or consult a skincare professional.

• Clinically tested with favorable user-reported outcomes on brightness and hydration.
• Dermatologist tested and commonly used in professional skincare settings.
• Patch test recommended for sensitive or reactive skin types.

Who is this for: Obagi Professional-C 20% Vitamin C Serum is aimed at adults seeking a concentrated antioxidant treatment to brighten dull or uneven skin tone, refine the appearance of fine lines, and boost skin radiance. It is suitable for those comfortable incorporating actives into their regimen and who will pair it with sun protection for daytime use.