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Kiehl's Since 1851 Ultra Pure High-Potency 5.0% Niacinamide Serum #1
Kiehl's Since 1851 Ultra Pure High-Potency 5.0% Niacinamide Serum #1

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Kiehl's Since 1851Ultra Pure High-Potency 5.0% Niacinamide Serum

Item 2607983

4.6 out of 5 stars. 543 reviews
Size:1.0 oz


Kiehl's Ultra Pure High-Potency 5.0% Niacinamide Serum is a concentrated facial serum formulated with just 10 ingredients to help visibly reduce oil and minimize the look of redness.



  • Free of fragrance and colorants, this concentrated serum is minimally formulated for skin absorption and efficacy

Key Ingredients

  • Niacinamide, the form of Vitamin B3 used within Kiehl's formulas, is known to help visibly brighten skin. When used in topical skincare formulas, Niacinamide can also help balance skin’s surface oil.

Research Results

  • After 1 Week, 92% Agree Skin Feels Soothed* Instantly Reduces Excess Oil by 58%** Reduced Blemishes in 1 Week***
  • *Reported by consumers in a 4-week study **Instrumental measurement in a 4-week clinical study ***Expert grading in a 4-week clinical study

How To Use

In the morning and evening, apply 2--3 drops to clean, dry skin.

Try out Kiehl's Niacinamide Serum skin hacks: Zone treat your face by applying Niacinamide Serum to areas prone to oiliness and breakouts. Follow with your favorite moisturizer where needed. Layer with Kiehl's Hyaluronic Acid Serum to hydrate & rebalance skin's moisture. Layer with Kiehl's Glycolic Acid Serum to gently exfoliate & improve texture.


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

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