C15 Super Booster
15% vitamin C with E and ferulic acid for brightening and antioxidant protection.
About this product
Paula's Choice C15 Super Booster is a stable, potent vitamin C serum combining 15% L-ascorbic acid with vitamin E (tocopherol) and ferulic acid — a trio proven to deliver synergistic antioxidant protection and brightening greater than any single ingredient alone. It targets dark spots, uneven skin tone, and environmental oxidative damage.
Best for oily, dry, combination, normal skin looking to address hyperpigmentation, dullness, UV damage — with a focus on brightening.
Product Attributes
pH Level
Highly acidic — effective for exfoliation. Avoid layering with alkaline products.
How to Use
- 1Apply 3–4 drops to clean skin in the morning before moisturizer and SPF.
- 2Can be mixed into your moisturizer.
- 3Store away from direct sunlight — Vitamin C oxidises with light and air exposure.
- 4Use daily for best results.
Patch Test Recommended
This product contains high-strength actives. Before full application, apply a small amount to your inner arm or jaw and wait 24 hours to check for irritation.
If you experience redness, burning, or itching — discontinue use and consult a dermatologist.
Dermatologist Note
L-Ascorbic acid at 15% is at the clinically effective threshold — studies show 10–20% concentration provides meaningful antioxidant protection and collagen stimulation. The low pH (2.5–3.0) is necessary to keep vitamin C stable and active, but can cause tingling on sensitive skin. Store in a cool, dark place — oxidised vitamin C (turns orange/brown) provides no benefit.
Based on published clinical literature and dermatological research.
Ingredient Analysis
Full Ingredient List (INCI)
4 ingredientsListed in order of concentration (highest first)
Ascorbic Acid, Tocopherol, Ferulic Acid, Panthenol
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