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

Kiehl's Powerful-Strength Vitamin C Face Serum is a lightweight daily serum combining 12.5% pure Vitamin C (L‑Ascorbic Acid) and hyaluronic acid to improve skin texture and help brighten and smooth the complexion.

This concentrated yet lightweight serum is designed for morning and evening use to support a more even, radiant-looking complexion. The formula pairs a stable form of pure Vitamin C with hyaluronic acid to deliver antioxidant support and hydration to the skin surface. It’s presented in an easy-dispense pump so you can add it into your existing routine after cleansing and before moisturizer.

How quickly will I notice changes in my skin?

Users often report improvements in skin texture and radiance within a few weeks of consistent use, with reductions in the appearance of fine lines seen over a short course. Clinical testing cited by the brand tracked visible changes across an 8-week period.

• Visible texture and radiance improvements reported early in use
• Appearance of fine lines may diminish with continued application
• Full study observations documented over 4–8 weeks

How should I use this serum in my daily routine?

Apply twice daily after cleansing and toning, and before heavier creams or sunscreens. Dispense two pumps and smooth over the entire face while avoiding the immediate eye area; follow with moisturizer and SPF in the morning.

• Use morning and night for best results
• Two pumps per application covers face evenly
• Always follow with a moisturizer; use SPF during daytime

Is this serum suitable for sensitive or all skin types?

The formulation is designed to balance a potent concentration of pure Vitamin C with a hydrating ingredient to be compatible with many skin types, including some sensitive skin. If you have highly reactive skin, introduce it gradually or consult a skin specialist.

• Formulated to be suitable for a broad range of skin types
• Patented stabilization helps maintain efficacy while being mindful of tolerance
• Patch-test if you have a history of sensitivities

What benefits does hyaluronic acid add to the Vitamin C formula?

Hyaluronic acid helps support surface hydration so skin looks plumper and smoother, complementing Vitamin C’s role in improving brightness and texture. The combination aims to deliver both antioxidant support and moisture in one lightweight serum.

• Adds immediate-feel moisturization and a smoother skin surface
• Works with Vitamin C to enhance the appearance of radiance
• Lightweight texture layers easily under other products

Who is this for: This serum is intended for someone seeking a single-step, potent Vitamin C product to incorporate into a daily skincare regimen — ideal for buyers wanting improved radiance and texture with hydrating support. It’s suited to those who prefer a lightweight, easily layered serum and who will use it consistently as part of morning and/or evening routines. If you have known severe sensitivities, consider a patch test or consult a dermatologist before regular use.

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.