Kiehl's Powerful-Strength Vitamin C Face Serum — 12.5% Vitamin C with Hyaluronic Acid for Brighter, Smoother Skin

This daily serum combines a stabilized form of L-ascorbic acid (vitamin C) with hyaluronic acid to deliver antioxidant benefits and visible smoothing. The formula is created to be effective yet suitable for a wide range of skin types, including those sensitive to stronger treatments. Clinical testing reported improvements in radiance and texture within weeks when used consistently as part of a morning and evening routine.

How quickly will I see brighter, smoother skin?

Results vary by individual, but clinical testing indicates visible changes over a short timeframe. Users often notice immediate improvements in surface texture and radiance, with measurable reduction in fine lines in about two weeks and further improvement in deeper lines after continued use.

• Visible texture and glow improvement reported immediately after first uses
• Fine lines reduced in approximately two weeks with twice-daily application
• Continued use supports further softening of deeper wrinkles over several weeks

What are the key ingredients and why do they matter?

The serum centers on 12.5% pure vitamin C (L-ascorbic acid) for antioxidant activity, paired with hyaluronic acid to hydrate and plump the skin. The blend aims to protect against oxidative stress, promote even-looking skin tone, and support smoother surface appearance without heavy residue.

• L-ascorbic acid (12.5%) — concentrated antioxidant to boost radiance
• Hyaluronic acid — attracts and retains moisture for immediate plumping
• Stabilized patented formulation — preserves potency while remaining gentle

How do I add this serum to my skincare routine?

Use after cleansing and toning, both morning and night, and before moisturizer. Dispense two pumps and spread evenly over the face, avoiding the eye area; follow with sunscreen in the morning to protect results and skin health.

• Apply to clean, dry skin—two pumps per application recommended
• Use twice daily for optimal, clinically observed results
• Layer under your moisturizer and apply sunscreen during daytime use

Is this serum suitable for sensitive skin?

The formula is developed to balance potency with tolerability: it uses a stable, concentrated form of vitamin C while incorporating skin-hydrating hyaluronic acid. Sensitive skin may still benefit, but patch testing or gradual introduction is advised if you have highly reactive skin.

• Patented stability helps maintain effective vitamin C levels
• Lightweight texture minimizes heavy or greasy feeling on skin
• Patch test first and start with once-daily application if concerned

Who is this for: Kiehl's Powerful-Strength Vitamin C Face Serum is aimed at anyone seeking a non-greasy, clinically informed vitamin C treatment to improve radiance, refine texture, and reduce fine lines. It fits into morning and evening regimens for normal, combination, dry, oily, and many sensitive skin types—particularly useful for people who want visible results without complex application steps.

Ingredients

Propylene Glycol, Dimethicone, Glycerin, Ascorbic Acid, Ethylhexyl Palmitate, Cetyl PEG/PPG-10/1 Dimethicone, Dimethicone Crosspolymer, Ascorbyl Glucoside, Cyclohexasiloxane, Hydroxyethylpiperazine Ethane Sulfonic Acid, Lauroyl Lysine, Acrylonitrile/Methyl Methacrylate/Vinylidene Chloride Copolymer, Polysilicone-11, Adenosine, Hydrolyzed Hyaluronic Acid, Limonene, Isobutane, Citrus Aurantium Dulcis (Orange) Peel Oil, Citrus Limon Peel Oil/Lemon Peel Oil, Citral, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate.