Developed after years of research, the expert composition of this skin firming serum combines the strength of two potent blends. On one side, a Collagen Peptide Booster serum works to help support skin’s structure, smoothing the appearance of fine lines and improving elasticity. On the other, a rich blend of two powerhouse vitamins - B3 and C1 - to reignite luminosity and provides antioxidant protection, leaving skin looking more even.
Meticulously formulated and dermatologically tested, this dual-action vitamin & collagen peptides facial serum is suitable for all skin types. Its fast-absorbing, silky texture leaves skin feeling intensely nourished and rejuvenated.
Visible Results:
• +18% instant firmness*, 83% of women saw fewer wrinkles**, 87% of women saw more radiance**
• Skin looks visibly younger, more even, and more defined
• Dermatologically tested - suitable for all skin types
• Luxurious formula with fast and smooth absorption
Key Ingredients in L'Oréal Paris Le Duo Serum:
• Collagen Peptide Booster: Supports skin’s natural collagen production, promoting a firmer, smoother, and more youthful appearance.
• Vitamins B3 & C1: Helps to brighten dull skin, even skin tone, and strengthen the skin moisture barrier.
1Derivative of vitamin C.
*Instrumental test, 40 subjects, after 1 application.
**Cosmeto-clinical study, 46 subjects, after 4 weeks of twice daily usage.