Kiehl's 1.5% Hyaluronic Acid Serum – 1 fl oz Lightweight, Fast-Absorbing Hydration

Kiehl's 1.5% Hyaluronic Acid Serum is a lightweight, fast-absorbing facial serum designed to replenish surface moisture and help skin look plumper and more resilient.

This single-flask serum features a focused seven-ingredient formula centered on 1.5% hyaluronic acid to deliver targeted hydration without heavy textures. It sinks into clean skin quickly and is suitable for layering with other treatments or makeup, making it easy to add to both morning and evening routines. The texture aims to hydrate and support a smoother, more supple appearance after continued use.

How will this serum change my daily skin routine?

This serum is intended to slot in as a lightweight hydration layer that helps skin retain moisture and improves how subsequent products perform. Use it after cleansing and before creams or oils to lock in hydration without adding weight.

• Apply 2–3 drops to clean, dry skin morning and night.
• Layer under moisturizers and sunscreens for better barrier performance.
• Works well beneath thicker evening creams or facial oils.

What results can I expect and how quickly?

Visible changes focus on hydration and skin feel rather than drastic restructuring. Many users notice skin feels plumper and smoother within days, while ongoing use supports sustained moisture and a healthier-looking surface texture.

• Quick absorption for immediate supple sensation.
• Noticeably more hydrated skin within a week for many users.
• Best maintained with consistent twice-daily application.

Can I combine this with other serums, eye creams, or makeup?

Yes—its minimalist seven-ingredient formulation makes it easy to layer with other active serums, eye treatments, and makeup. It won’t interfere with most routines and can even be mixed with makeup products to increase hydration and soften coverage.

• Blend a drop into liquid foundation or highlighter for a dewy finish.
• Apply beneath eye cream for targeted under-eye moisture boost.
• Safe to layer with antioxidant serums and SPF products.

Is this serum suitable for sensitive or dry skin types?

The concentrated hyaluronic acid base is formulated to support dry and dehydrated skin by improving moisture retention while keeping formulation simple to reduce irritation risk. If you have reactive skin, patch testing is recommended before full-face use.

• Minimalist 7-ingredient formula aimed at gentle hydration.
• Ideal for dry, dehydrated, and combination skin needing moisture.
• Patch test if your skin is highly reactive to new products.

Who is this for: Kiehl's 1.5% Hyaluronic Acid Serum is tailored for anyone seeking an easy-to-use, non-greasy hydration booster—especially those with dry or moisture-depleted skin, people who like to layer targeted serums, and makeup users who want a hydrated, smoother base. It suits morning and evening routines and is useful for anyone wanting visible plumping and improved skin feel without a complex ingredient list.

Ingredients

Aqua/Water, Glycerin, Sodium Hyaluronate, Phenoxyethanol, Chlorphenesin, Tetrasodium Glutamate Diacetate, Citric Acid