Obagi Medical Professional‑C Vitamin C Serum 20% — 0.42 oz high‑potency L‑ascorbic acid for brightening & reducing fine lines

This concentrated serum from Obagi Medical delivers one of the highest stable doses of pure Vitamin C in a compact 0.42 oz bottle. Formulated to work at an optimized pH for stability and skin penetration, it targets uneven tone and signs of aging while supporting the skin’s barrier against environmental stressors. Clinically tested and dermatologist‑evaluated, it’s intended as a step in a professional skincare routine rather than a standalone treatment.

How quickly will I notice brighter skin?

Individual results vary, but many users report visible improvements in radiance and hydration within weeks of consistent use. The high L‑ascorbic acid concentration is aimed at accelerating antioxidant effects that help even tone and reduce dullness.

• High‑potency 20% L‑ascorbic acid for rapid antioxidant activity
• Optimized pH to improve stability and skin absorption
• Clinically tested formula with consumer study results on brightness
• Best used daily in AM under sunscreen for protection

Is this serum suitable for sensitive or acne‑prone skin?

The formula contains pure Vitamin C at a strong concentration, so people with sensitive skin should introduce it gradually and monitor tolerance. For acne‑prone skin, it can be beneficial because Vitamin C supports repair and barrier strength, but patch testing is recommended.

• Start with alternate‑day application if sensitivity is a concern
• Perform a patch test behind the ear or inner forearm first
• Avoid concurrent use with strong exfoliants until tolerance is established
• Consult a dermatologist when combining with prescription treatments

How do I incorporate it into my skincare routine?

Apply the serum after cleansing and toning but before heavier creams and sunscreen. Use a few drops and allow it to absorb fully; follow with moisturizer and, in the morning, broad‑spectrum sunscreen to protect results.

• Cleansed, dry skin before application maximizes penetration
• Use morning to complement sunscreen protection and evening if preferred
• Pair with hydrating and barrier‑supporting moisturizers for comfort
• Store in a cool, dark place to prolong potency

What makes Obagi’s 20% Vitamin C different from other serums?

Obagi’s Professional‑C uses pure L‑ascorbic acid at a concentration and pH designed for clinical effectiveness and skin permeability. The brand’s medical background and clinical testing contribute to formulation choices aimed at consistent performance.

• Uses pharmaceutical‑grade L‑ascorbic acid, the gold standard of Vitamin C
• Formulated at pH levels shown to improve stability and efficacy
• Backed by clinical and consumer testing in Obagi’s product development
• Physician endorsed and commonly recommended in professional regimens

Who is this for? Obagi Professional‑C 20% Vitamin C Serum is best suited for adults seeking a medically rooted, high‑strength antioxidant step to address dullness, uneven tone, and early signs of aging. It’s ideal for those willing to introduce a potent active gradually, follow with sunscreen, and who appreciate dermatologist‑tested, clinically oriented skincare solutions.