Kiehl's Powerful-Strength Vitamin C Face Serum 12.5% - Lightweight Vitamin C + Hyaluronic Acid for Radiance & Texture

Kiehl's Powerful-Strength Vitamin C Face Serum is a lightweight daily serum with 12.5% pure Vitamin C and hyaluronic acid designed to boost radiance, refine texture, and visibly reduce the appearance of fine lines and wrinkles.

This serum combines a stabilized form of L-ascorbic acid with moisture-retaining hyaluronic acid in a formula that is intended for twice-daily use. Clinical testing referenced by the brand shows measurable improvements in skin texture and glow within weeks; the formulation is presented as suitable for a variety of skin types, including those prone to sensitivity. The texture is described as lightweight and quickly absorbent, making it easy to layer under moisturizers or sunscreen.

How quickly will I notice changes to my skin?

Visible improvements are reported on a timeline in consumer and clinical evaluations: radiance and texture often shift first, with lines appearing reduced over subsequent weeks. Individual results vary by skin type, regimen consistency, and other skincare steps used.

• Radiance and texture can improve within days to two weeks for many users.
• Fine lines are reported to look diminished after about two weeks.
• Deeper wrinkles may take four weeks or longer to show visible change.
• Consistent morning and evening application increases reliable results.

How do I add this serum into my daily routine?

Use the serum after cleansing and toning, then follow with moisturizer and sunscreen in the morning. Apply two pumps to the face avoiding the eye area; allow it to absorb before layering other products.

• Morning: cleanse, tone, apply 2 pumps of serum, then moisturizer and SPF.
• Evening: cleanse, tone, apply serum, then your night moisturizer or treatment.
• Start with once daily if you have very sensitive skin, then increase to twice daily as tolerated.
• Avoid mixing with high-acid exfoliants at the same time to reduce irritation risk.

Is this serum right for sensitive or combination skin?

The formula uses a patented stabilization approach to keep Vitamin C effective while aiming to be gentle enough for many skin types. If your skin is reactive, begin with lower frequency and patch-test to assess tolerance before full-face use.

• Patented stabilization helps maintain potency without excessive irritation.
• Hyaluronic acid adds hydration to support barrier comfort.
• Recommended to patch-test behind the ear or on the jawline first.
• Adjust frequency or combine with calming products if redness appears.

What kind of benefits does Vitamin C plus hyaluronic acid provide?

Vitamin C is an antioxidant that supports skin brightness and can improve the look of uneven texture, while hyaluronic acid hydrates to plump the skin surface and smooth the look of lines. Together they address both surface moisture and visual signs of aging for a more even, luminous appearance.

• Vitamin C helps even skin tone and enhance glow.
• Hyaluronic acid attracts moisture for temporary plumping.
• The combination targets texture, radiance, and the look of fine lines.
• Lightweight feel makes it suitable for layering under makeup.

Who is this for: This serum is designed for anyone seeking a daily antioxidant step that targets dullness, uneven texture, and the appearance of fine lines. It suits most skin types — including normal, combination, and many sensitive skins when used gradually — and fits into both simple and comprehensive skincare routines for users focused on brightness and smoother-looking skin.

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.