Kiehl's Niacinamide Face Serum 5% — Ultra Pure High-Potency, 1 fl oz, Oil‑Control & Soothing

Kiehl's Ultra Pure High-Potency 5.0% Niacinamide Serum is a lightweight, concentrated treatment designed to reduce excess surface oil, calm redness, and help refine the look of imperfections for a clearer, more balanced complexion.

This targeted serum delivers a high concentration of niacinamide in a minimal-formula formula built for everyday use. With just ten thoughtfully selected ingredients, it absorbs quickly without heaviness or sticky residue, making it suitable for oily, combination, and acne-prone skin. Regular use helps visibly manage shine and supports a smoother, brighter-looking skin surface.

How will this serum help reduce midday shine?

The 5% niacinamide concentration works at the skin surface to help regulate sebum production and reduce the greasy look that develops over the day. Because the texture is lightweight and fast-absorbing, it layers easily under moisturizers and makeup without adding extra sheen.

• Contains 5.0% niacinamide to support oil balance.
• Non-greasy, quick-absorbing formula suitable for layering.
• Helps reduce visible excess oil and immediate shine.

Can this serum calm redness and visible imperfections?

Niacinamide is known for supporting the skin’s appearance by soothing and reducing the visibility of redness and uneven texture. While results vary by skin type and concern, many users notice a more even tone and fewer visible blemishes when used consistently morning and evening.

• Helps soothe irritated-looking skin and target redness.
• Aids in minimizing the appearance of pores and imperfections.
• Best results seen with regular twice-daily application.

How do I use the serum in my routine?

Apply 2–3 drops to cleansed, dry skin in the morning and/or evening, then follow with your moisturizer and sunscreen during the day. Because the formula is concentrated, a small amount covers the face; start with fewer drops if you have sensitive skin and build up as tolerated.

• Use 2–3 drops on clean, dry skin morning and/or night.
• Layer under moisturizer and SPF for daytime protection.
• Introduce gradually if combining with active ingredients like strong acids or retinoids.

Is this serum safe for everyday use on different skin types?

The simplified 10-ingredient composition is designed to be gentle yet effective across many skin types, including oily and combination skin. It is paraben-free and formulated to minimize unnecessary additives, but patch testing is recommended for very sensitive skin or if you are using other potent actives.

• Minimal-ingredient formula suitable for many skin types.
• Paraben-free and formulated to avoid heavy emollients.
• Patch test recommended when combining with other actives.

Who is this for? This serum is aimed at people seeking a concentrated, no-frills approach to controlling excess oil, reducing visible redness, and refining the look of imperfections. It’s particularly useful for those with oily, combination, or blemish-prone skin who want a lightweight daily treatment that layers easily under other skincare and makeup. If you prefer simple ingredient lists and want a targeted niacinamide boost without heavy textures, this 1 fl oz Kiehl's serum is formulated to fit into a straightforward skincare routine.

Ingredients

Aqua/Water, Niacinamide, Glycerin, Propanediol, Methyl Gluceth-20, Hydroxyacetophenone, Sodium Hyaluronate, Caprylyl Glycol, Carbomer, Sodium Hydroxide