Kiehl's Niacinamide Serum 5.0% — 1 fl oz Lightweight Oil-Control, Paraben-Free

Kiehl's Ultra Pure High-Potency 5.0% Niacinamide Serum is a concentrated facial serum designed to visibly reduce excess oil and shine while helping to minimize the look of imperfections for a clearer, more even-looking complexion.

This lightweight, 1 fl oz serum combines a 5.0% niacinamide concentration with a pared-back formula of just ten ingredients to target surface oiliness and redness without heavy textures. Formulated for frequent use, it absorbs quickly and layers easily under moisturizers and sunscreen, making it simple to incorporate into both morning and evening routines.

How does this serum help control shine and excess oil?

The 5.0% niacinamide works at the skin’s surface to help balance sebum production, which can reduce the visible sheen on oily or combination skin. Rather than stripping, the formula aims to rebalance the skin so it looks less greasy and more refined over time.

• Targets surface oil to reduce shine throughout the day
• Lightweight texture absorbs quickly without residue
• Non-comedogenic formulation suitable for layering

Will it help with redness and the appearance of imperfections?

The serum is designed to soothe and help even out the look of skin tone, addressing the appearance of redness and minor blemish marks. Regular use can make pores and uneven texture appear less noticeable, contributing to a more uniform complexion.

• Helps visibly calm redness for a calmer-looking complexion
• Improves the look of texture and uneven areas
• Can be used consistently morning and/or night for cumulative results

How should I use the Kiehl's 5% Niacinamide Serum in my routine?

Apply 2–3 drops to clean, dry skin after cleansing and before heavier creams or oils. Because it’s lightweight and low in active ingredients beyond niacinamide, it pairs well with most serums, moisturizers, and sunscreens without pilling.

• Use 2–3 drops on face and neck, morning and/or evening
• Layer under moisturizer and sunscreen during daytime
• Patch-test new combinations if you use strong actives like retinoids or acids

What makes this formulation different from other niacinamide products?

This serum emphasizes purity and potency: a clear 5.0% niacinamide concentration in a minimal-ingredient formula intended to reduce irritation risk and improve predictability. The simplified ingredient list aims to deliver the active without unnecessary fragrances or additives.

• Concentrated 5.0% niacinamide for targeted performance
• Minimalist formula with just ten ingredients to limit potential irritants
• Paraben-free and suitable for many skin types, including oily and combination skin

Who is this for: Kiehl's Ultra Pure High-Potency 5.0% Niacinamide Serum is crafted for people with oily or combination skin seeking a straightforward, effective way to reduce shine and even skin tone. It’s also a good choice for anyone who prefers concentrated, low-ingredient skincare solutions that layer smoothly under creams and sunscreen. If you have very sensitive skin, consider a patch test first or consult a skincare professional to confirm compatibility with other active ingredients you use.

Ingredients

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