What it is: A serum that unleashes the strength of THD ascorbate, an ultra-stable scientific breakthrough ingredient 50 times more powerful than vitamin C.

What it does: Packed a with jaw-dropping concentration of 20% vitamin C, this serum's efficacy is amplified by the addition of two ultra-powerful ingredients—3% vitamin E and 2% ferulic acid—delivering complete and advanced anti-aging, firming and brightening benefits. This rich, moisturizing serum is a must to help improve the look of fine lines, wrinkles, firmness, uneven skin tone, texture and breakage.

How to use: Apply to clean, dry skin. For best results, use twice daily on the face and neck.

• 1 oz.
• Paraben-free; sulfate-free; alcohol-free; fragrance-free; gluten-free

Peter Thomas Roth: Launched in 1993, Peter Thomas Roth blends ancient Hungarian health and skin care philosophies with 21st-century technologies and ingredients. Founder Peter Thomas Roth's passion for skin care grew from his family's heritage as spa owners in Hungary, coupled with a personal quest to find solutions for his own skin problems. The result is breakthrough formulas that deliver astonishing results.