Kiehl's Vitamin C Face Serum 12.5% with Hyaluronic Acid — Lightweight, Fast‑Absorbing Boosts Radiance & Smooths Texture

Kiehl's Powerful-Strength Vitamin C Face Serum is a lightweight, fast-absorbing serum that combines 12.5% pure Vitamin C (L‑Ascorbic Acid) with hyaluronic acid to help improve skin texture, boost radiance and visibly reduce the appearance of fine lines and wrinkles.

This concentrated serum blends a stabilized form of Vitamin C with moisture-binding hyaluronic acid in a lightweight base designed for daily use. The formula is developed to absorb quickly without heavy residue, making it easy to layer under moisturizers and sunscreens. Clinical testing cited by the brand has shown visible improvements in texture and radiance over weeks of regular use, while the patented stabilization helps maintain Vitamin C potency in a formula suitable for many skin types.

How quickly will I notice changes in my skin?

Results vary by individual, but Kiehl's clinical observations reported earlier improvements in skin texture and radiance within the first weeks of consistent use. Fine lines were observed to appear reduced in some users after two weeks, with further improvements over a month.

• Expect initial radiance and texture improvements within 1–2 weeks for many users.
• Visible reduction in fine lines reported around two weeks in test groups.
• Continued improvements in deeper lines and overall smoothness with ongoing use.

How do I add this serum into my daily routine?

Use the serum twice daily after cleansing and toning and before applying moisturizer. Apply on clean, dry skin: two pumps spread evenly over the face, avoiding the eye area, then follow with your regular moisturizer and broad‑spectrum sunscreen in the morning.

• Morning and night application recommended for best results.
• Two pumps per application covers face; avoid direct contact with eyes.
• Layer under moisturizer and sunscreen during daytime.

Is this serum suitable for sensitive or combination skin?

The formula uses a stabilized form of L‑Ascorbic Acid alongside hyaluronic acid to balance potency with skin tolerance. While many skin types—including sensitive and combination—may use it, a patch test is advised when introducing an active Vitamin C product.

• Formulated to be suitable for a broad range of skin types.
• Contains hyaluronic acid to support hydration and reduce potential drying effects.
• Perform a small patch test if you have highly reactive skin.

What makes this Vitamin C serum different from others?

This serum combines a high concentration of pure L‑Ascorbic Acid with a patented stabilization process and hyaluronic acid for hydration. The combination aims to deliver antioxidant support, improve surface texture and deliver a brighter-looking complexion while maintaining formula stability.

• 12.5% L‑Ascorbic Acid concentration for targeted antioxidant potency.
• Hyaluronic acid to help retain skin moisture and plump the surface appearance.
• Patented stabilization helps maintain active Vitamin C strength in the bottle.

Who is this for: Kiehl's Powerful-Strength Vitamin C Face Serum is intended for people seeking a lightweight, active serum to support brighter, smoother-looking skin. It is suitable for most skin types, including combination and many sensitive skin users, when introduced carefully. Ideal for those who want to add a reliable Vitamin C step into their morning and evening routines to help improve radiance and surface texture while maintaining daily hydration.

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.