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Vital Skin-Strengthening Hyaluronic Acid Super Serum - Kiehl's

by Kiehls


What It Is

Our Hyaluronic Acid serum strengthens skin to help resist signs of aging, while boosting radiance and smoothing fine lines. Formulated with 11kDa Hyaluronic Acid — our smallest form of Hyaluronic Acid, which penetrates 8 skin surface layers deep** — and an Adaptogenic Herbal Complex, our serum neutralizes the effects of external skin-aging stressors for youthful, radiant skin.

*Based on a clinical study of 25 panelists measuring the penetration of the full formula via tape stripping.

What It’s Good For

  • Helps correct visible signs of aging, which can be caused by skin stressors including pollution, stress and sun exposure
  • Clinically shown to improve skin texture by 41%*
  • Clinically demonstrated to boost radiance by 29% and improve resilience by 38% for glowing, healthy-looking skin*
  • Clinically demonstrated to visibly reduce fine lines by 27%*
  • Clinically demonstrated* to double skin’s strength**
  • Absorbs easily with a lightweight texture
  • For all skin types, including sensitive skin
*Based on a 4-week clinical study on 58 subjects tested in urban and polluted environments.

**Based on Strength Index = Composite, average score of clinically graded parameters after using the product for 4 weeks vs one week of use.

Key Ingredients


Our smallest molecular size of Hyaluronic Acid, this micronized ingredient penetrates to fortify skin within its deepest surface layers.* By delivering skin-strengthening hydration to skin’s most vulnerable layer, 11kDa Hyaluronic Acid helps better retain moisture for improved resiliency, suppleness and bounce.
*Stratum corneum


Our Adaptogenic Herbal Complex is a proprietary blend of adaptogens — Red Ginseng Root, Holy Basil and Schisandra Berry — traditionally used in Traditional Chinese, Korean and Ayurvedic Medicine. Within our formula, these adaptogens work synergistically to defend skin from stressors while renewing and resurfacing skin’s texture for a smooth, radiant appearance.

    How to Use

    • Apply our Hyaluronic Acid serum onto cleansed face and neck, morning and night
    • Can also be used before another serum
    • Then apply a daily moisturizer
    • Avoid contact with eyes
    • If contact occurs, rinse thoroughly with water

    Did You Know?

    Every day your skin comes into contact with stressors that can all lead to premature skin aging. UV exposure, pollution and extreme temperatures along with tobacco, stress, lack of sleep and nutrition can all have negative impacts on your skin and cause dullness, dryness, dehydration, fine lines and other signs of aging. Our formula is clinically demonstrated* to double skin’s strength** to help protect against the stress-related signs of aging to help keep your skin more radiant and healthy-looking.

    *Based on a 4-week clinical study on 58 subjects tested in urban and polluted environments.

    **Based on Strength Index = Composite, average score of clinically graded parameters after using the product for 4 weeks vs one week of use.

    Complete Your Routine

    Discover efficacious formulas to upgrade your routine.
    Step 1

    Vital Skin-Strengthening Hyaluronic Acid Super Serum

    A Hyaluronic Acid serum with an Adaptogenic complex that strengthens skin and boosts radiance.

    Old price $52.00 New price $39.00
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    Step 2

    Midnight Recovery Concentrate Face Oil

    A moisturizing face oil that visibly restores skin while you sleep. Paraben-free & alcohol-free.

    Old price $78.00 New price $58.50
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    Step 2

    Avocado Eye Cream

    A hydrating eye cream that de-puffs and brightens under eyes. Paraben-free and fragrance-free.

    Old price $50.00 New price $37.50
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    Step 3

    Ultra Facial Cream with Squalane

    Our #1 moisturizing cream for ultra-lightweight, 24-hour hydration, formulated with Squalane. For all skin types, including sensitive. Paraben-free & fragrance-free

    Old price $32.00 New price $24.00
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    Future Made Better

    True to our founding family’s mission, we strive to improve the quality of the communities we serve by reducing our
    environmental impact, formulating responsibly, and supporting charitable causes. This formula is made with:
    Responsible Formulation
    Commitment to Recycling
    Reviews Questions & Answers
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