Experience Obagi's most powerful Vitamin C formula with Professional-C® Serum 20% — the maximum-strength stabilized L-Ascorbic Acid serum for those seeking the highest level of antioxidant protection, brightening, and collagen stimulation. At 20%, this serum delivers clinically significant results against photoaging, hyperpigmentation, and free radical damage — the choice of skincare professionals and experienced Vitamin C users who demand peak efficacy.
Key Benefits
- Maximum-strength 20% L-Ascorbic Acid for the highest antioxidant defense
- Dramatically brightens skin and visibly reduces dark spots and discoloration
- Provides the most potent free radical neutralization of the Professional-C® line
- Powerfully stimulates collagen production to reduce wrinkles and restore firmness
- Visibly improves skin tone, texture, and overall radiance
- Ideal for experienced Vitamin C users and those with significant photoaging
Skin Type & Concerns
Skin Type: All Skin Types (best for non-sensitive, Vitamin C–experienced skin)
Addresses: Advanced photoaging, deep hyperpigmentation, dark spots, wrinkles, loss of firmness, dullness, significant free radical damage
How to Use
After cleansing and toning, apply 3–4 drops of Professional-C® Serum 20% to the face and neck — morning and/or evening. Allow to fully absorb before applying moisturizer. Always finish with broad-spectrum SPF 50 in the morning. Begin with once-daily use if transitioning from a lower concentration; increase to twice daily as tolerated.
Key Ingredients
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L-Ascorbic Acid (20%) — The highest clinically recommended concentration of pure, stabilized Vitamin C; delivers maximum antioxidant protection, accelerated brightening, and the most robust collagen-stimulating activity of the Professional-C® serum range
Professional Tips
The 20% formula is most effective for those who have already built a tolerance to Vitamin C through consistent use of the 10% or 15% concentrations. If stinging or redness occurs, reduce frequency or step down to Professional-C® Serum 15%. Vitamin C oxidizes when exposed to light and air — keep the bottle tightly sealed and stored in a cool, dark place.
