Eau Thermale Avène Hydrance Boost Hydrating Serum 1.0 oz — 48‑Hour Hyaluronic Acid & Niacinamide

Eau Thermale Avène Hydrance Boost Concentrated Hydrating Serum is a lightweight water‑gel serum that delivers an immediate surge of hydration and helps maintain skin moisture for up to 48 hours.

This fast‑absorbing serum combines hydrating humectants with skin‑supporting nutrients to restore comfort and bounce to dry or thirsty skin. The formula centers on hyaluronic acid (high molecular weight) to attract and hold moisture, plus Vitamin B3 to support the skin barrier and a natural moisturizing factor (NMF) booster that encourages the skin's own hydration mechanisms. Presented in a precision dropper bottle, the serum layers easily under moisturizers and makeup without leaving greasiness.

How quickly does the serum hydrate skin?

The water‑gel texture is designed to sink in immediately and provide an intense, refreshingly cool sensation that boosts surface hydration right away. Laboratory and consumer testing showed a substantial increase in skin hydration shortly after application, with sustained levels reported up to 48 hours when used as directed.

• Instant lightweight absorption that feels non‑sticky
• Targets skin’s moisture with humectants like hyaluronic acid
• Reported improvement in hydration for up to 48 hours

Which key ingredients support hydration and barrier health?

The formula balances humectants and barrier‑support actives rather than relying on oils. Hyaluronic acid pulls and retains moisture at the skin surface while Vitamin B3 (niacinamide) contributes to barrier resilience and skin comfort. A proprietary NMF‑boosting complex helps stimulate the skin’s own ability to hold water.

• High molecular weight hyaluronic acid for surface hydration
• Vitamin B3 to support barrier function and even skin texture
• NMF booster to enhance natural moisture retention

How do you use this serum in a daily routine?

Apply a few drops to cleansed skin morning and/or night, smoothing evenly across face and neck. The dropper delivers a controlled dose so you can layer it under a cream or sunscreen without pilling. Because it’s lightweight and non‑oily, it fits well under makeup or richer creams when extra nourishment is needed.

• Use 2–4 drops on clean, dry skin; pat gently until absorbed
• Layer under moisturizer or combine with creams for added hydration
• Suitable for morning and evening routines; follow with SPF during daytime

What is omitted from the formula and who tested it?

The serum avoids parabens, alcohol, oils, silicones, mineral oil, animal‑derived ingredients, phenoxyethanol, EDTA, BHT, PEGs, chlorphenesin and sulfates, aligning with a cleaner, gentle formulation approach. A consumer study noted high satisfaction for both efficacy and sensory feel, and the composition is predominantly all‑natural in ingredient origin.

• Formulated without common irritants and unwanted additives
• 98% ingredients of natural origin in the current formulation
• Positive consumer feedback on hydration performance and texture

Who is this for? The Hydrance Boost Concentrated Hydrating Serum is suited to anyone with dry, dehydrated, or combination skin seeking an immediately refreshing, non‑greasy hydration boost. It works well as a standalone moisture booster for mildly dry skin or as an intensive layering step for drier complexions and those wanting a lightweight serum that supports barrier function without heavy emollients.

Ingredients

Avene Thermal Spring Water (Avene Aqua), Propanediol Glycerin, Pentylene Glycol Diglycerin, 1.2-Hexanediol, Niacinamide, Sodium Hyaluronate, Betaine, Citric Acid, Fragrance (Parfum), PCA, Polyglyceryl-4 Caprate Sclerotium Gum, Sodium Citrate, Sodium Hydroxide, Water (Aqua).