Professional-C® 15% Vitamin C Antioxidant Serum

Elevate your antioxidant protection and brightening results with Professional-C® 15% Vitamin C Antioxidant Serum — a potent, stabilized L-Ascorbic Acid serum positioned between the entry-level 10% and the maximum-strength 20% formulas. At 15%, this serum delivers enhanced free radical defense, more pronounced dark spot reduction, and meaningful collagen-stimulating activity — ideal for those who have already acclimated to Vitamin C and want to increase efficacy without maximum intensity.

Key Benefits

• 15% L-Ascorbic Acid provides enhanced antioxidant and brightening efficacy
• Visibly reduces the appearance of dark spots and uneven skin tone
• Neutralizes free radicals from UV exposure and environmental stressors
• Stimulates collagen synthesis to improve firmness and reduce fine lines
• Ideal for those stepping up from the 10% concentration
• Fast-absorbing, lightweight serum texture

Skin Type & Concerns

Skin Type: All Skin Types

Addresses: Dark spots, hyperpigmentation, dullness, photoaging, fine lines, loss of firmness, free radical damage

How to Use

After cleansing and toning, apply 3–4 drops of Professional-C® Serum 15% to the face and neck — morning and/or evening. Allow to absorb fully before applying moisturizer. Always follow with broad-spectrum SPF 50 in the morning. For best results, use consistently every day.

Key Ingredients

• L-Ascorbic Acid (15%) — A stabilized, high-potency form of pure Vitamin C that delivers superior antioxidant protection, visibly brightens the complexion, and supports natural collagen production at a concentration well-tolerated by most skin types

Professional Tips

Step up to 15% after 4–6 weeks on the 10% formula, or begin here if your skin is not highly sensitive and you have some experience with Vitamin C. For maximum antioxidant and brightening intensity, see Professional-C® Serum 20%. Store in a cool, dark location and discard if the serum turns orange or brown — oxidized Vitamin C loses efficacy.