Obagi Medical Professional-C Serum 15% L-ascorbic Acid 1 fl oz — Brightening Antioxidant for Fine Lines

Obagi Medical Professional-C Serum is a high-potency 15% L-ascorbic acid vitamin C serum designed to brighten skin, visibly reduce the look of fine lines, and support the skin’s barrier when used in a daily regimen.

This physician-developed serum blends a lab-stable form of pure vitamin C with a formula tuned for effective skin absorption. It’s created for morning use as part of a layered routine alongside broad-spectrum sunscreen, and is suitable for those who want measurable brightness and more resilient-looking skin without prescription-only ingredients.

How does Professional-C Serum improve skin brightness?

The serum delivers L-ascorbic acid, the scientifically recognized form of vitamin C, at a concentration and pH chosen to maximize stability and penetration. Regular application helps even skin tone and reduces the visual impact of past environmental damage by targeting surface dullness.

• 15% L-ascorbic acid concentration for potent antioxidant support
• Formulated at optimal pH to increase skin uptake
• Lightweight texture that layers under moisturizers and sunscreen
• Use in the morning to complement sun protection for better results

Will this serum help reduce fine lines and restore texture?

While not a prescription retinoid, the antioxidant activity of vitamin C helps protect collagen from oxidative stress and can improve the appearance of fine lines with consistent use. It works as part of a broader “ABCs” approach—vitamin A at night and vitamin C plus sunscreen by day—for noticeable texture improvements over time.

• Neutralizes free radicals that accelerate visible aging
• Supports the skin’s natural resilience and elasticity
• Best combined with evening retinol to optimize results
• Dermatologist-tested formula suitable for clinical routines

How should I include this serum in my daily skincare routine?

Apply a few drops to clean, dry skin each morning before moisturizer and sunscreen. Allow it to absorb fully; vitamin C works most effectively when paired with daily broad-spectrum SPF to prevent further oxidative damage.

• Use 2–3 drops on face and neck after cleansing
• Follow with hydrator and broad-spectrum sunscreen every morning
• Combine with nightly retinol as part of the ABCs of skincare
• Avoid mixing with high-pH products at the same application to preserve efficacy

Is this serum appropriate for sensitive or darker skin tones?

Obagi Medical designs its formulas to be widely usable across skin tones and types; the 15% vitamin C is potent but generally well tolerated when introduced gradually. If you have sensitive skin, start with fewer applications per week and increase frequency as tolerated.

• Clinically tested on a range of skin tones historically by the brand
• Introduce slowly if you have reactive skin—every other day initially
• Patch-test on the inner forearm if concerned about sensitivity
• If irritation occurs, reduce use or consult a skincare professional

Who is this for: Obagi Medical Professional-C Serum is aimed at people seeking a physician-backed, high-strength vitamin C option to brighten complexion, support barrier health, and reduce the visible effects of aging and environmental exposure. It fits into morning routines for adults wanting measurable skin-brightening without moving to prescription-only treatments.

Ingredients

Propylene glycol, water, L-ascorbic acid, alcohol, ascorbyl glucoside, fragrance