No.5 Vitamin Concentrated Serum

Tracked ingredients

Key actives from our research database. Click any to read the full evidence dossier.

Layering conflicts

Ingredients in this product that can react with common actives. Avoid stacking unless noted.

• Benzoyl Peroxidemedium

  Benzoyl peroxide breaks down vitamin C, making both less effective. Use one in the morning and the other at night.

• Retinollow

  Vitamin C and retinol work best at different pH levels. Use vitamin C in the morning and retinol at night.