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Kiehl's Since 1851 Ultra Pure Hyaluronic Acid 1.5% Serum scores 6.1/9.8 overall. It ranks highest in low irritation risk (9.5) and formulation safety (9.0).
One of the most effective humectants
Smaller molecule form of hyaluronic acid
Broad-spectrum preservative
Estimated — based on ingredient analysis. Scores refine as user reviews are added.
Scores last verified: June 2026
Kiehl's Since 1851 Ultra Pure Hyaluronic Acid 1.5% Serum is a decent serum with an overall score of 6.1/9.8. Positioned in the premium bracket, it takes a straightforward approach to skincare. The formula leads with Glycerin, Sodium Hyaluronate — ingredients that support the skin barrier and moisture levels.
It performs well on low irritation risk (9.5). On the flip side, hydration could be stronger and active ingredient concentration is on the lighter side.
Great for
May not suit
Draws in moisture — #2 in the INCI list
Draws in moisture — #3 in the INCI list
7 ingredients — listed in INCI order (highest concentration first)
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© 2026 Gracie. All rights reserved. Data sourced from Open Beauty Facts (ODbL) and EU CosIng.