What does Vitamin C serum do for your skin?

Vitamin C serum brightens skin, fades dark spots, boosts collagen production, and protects against environmental damage. It's one of the most researched skincare ingredients for improving skin tone, texture, and firmness. Regular use results in a more radiant, even complexion.

Should I use Vitamin C serum in the morning or evening?

Vitamin C serum is best used in the morning because it provides antioxidant protection against UV damage and environmental stressors throughout the day. Apply after cleansing and before sunscreen. It can also be used in the evening for enhanced brightening.

What percentage of Vitamin C is effective?

Research shows that 2-20% Vitamin C is effective. Higher percentages aren't always better—2% Vitamin C (as used in Acure's formula) is effective for brightening and antioxidant protection while being gentle enough for daily use. Higher concentrations can cause irritation.

Why is ferulic acid paired with Vitamin C?

Ferulic acid stabilizes Vitamin C, preventing oxidation and extending its effectiveness. It also enhances Vitamin C's photoprotective benefits by up to 8x. The combination provides superior antioxidant protection and brightening compared to Vitamin C alone.

Can I use Vitamin C serum with retinol?

Yes, but not at the same time. Use Vitamin C serum in the morning and retinol in the evening. Vitamin C protects against environmental damage during the day, while retinol accelerates cell turnover at night. They complement each other when used in separate routines.

How long does it take for Vitamin C serum to work?

You may notice brighter, more radiant skin within 2-4 weeks. Dark spots and hyperpigmentation typically take 8-12 weeks to fade significantly. Consistent daily use is essential—Vitamin C's benefits accumulate over time.

Why did my Vitamin C serum turn yellow/orange?

Vitamin C oxidizes when exposed to air and light, turning yellow, orange, or brown. A slight yellow tint is normal, but brown indicates the product has lost effectiveness. Store in a cool, dark place and use within 3-6 months of opening for best results.