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

Designed to quench dehydrated skin without heaviness, this Avène serum uses moisture-binding humectants in a refreshing gel texture to replenish and reinforce the skin’s natural moisture levels. The formula focuses on rapid hydration, barrier support, and a non-greasy finish that layers easily under creams or makeup. With 98% naturally derived ingredients and a precise dropper for controlled application, it targets thirsty skin that needs long-lasting moisture and improved texture.

How quickly does this serum hydrate the skin?

You’ll feel a cooling, water-like texture on contact that absorbs fast and reduces dryness sensations almost immediately. The serum is formulated to increase skin hydration significantly and supports moisture retention for extended periods.

• Instant water-gel feel for quick absorption
• Contains high molecular weight hyaluronic acid for surface hydration
• Reported improvement in skin hydration in consumer testing
• Provides up to 48 hours of longer-lasting hydration when applied as directed

What active ingredients make hydration last?

The formula combines humectants and barrier-supporting ingredients to both attract water and help the skin hold it. Vitamin B3 (niacinamide) and a Natural Moisturizing Factor (NMF) booster work with hyaluronic acid to preserve moisture and reinforce the skin’s natural defenses against dehydration.

• Hyaluronic acid attracts and binds surface water molecules
• Vitamin B3 helps strengthen the skin barrier and improve moisture retention
• NMF booster stimulates the skin’s own hydration mechanisms
• Light texture prevents pore-clogging and sits well under other products

How do I use this serum in my routine?

Apply the serum to clean, dry skin morning and/or night before cream or sunscreen for best results. The dropper bottle dispenses small, precise amounts so you can layer the product without over-applying.

• Use 2–3 drops for face and neck; pat gently until absorbed
• Follow with moisturizer to seal in hydration for extended wear
• Works well under makeup and with most hydrating treatments
• Avoid combining with incompatible actives only if advised by a dermatologist

Is the formula suitable for sensitive or reactive skin?

The serum is formulated to be gentle: it excludes parabens, alcohol, oil, silicones, mineral oil, animal-origin ingredients, phenoxyethanol, EDTA, BHT, PEG, chlorphenesin and sulfates. Avène’s thermal spring water heritage informs a soothing approach, but as with any concentrated treatment, patch testing is recommended for very reactive skin.

• 98% naturally derived formula minimizes unnecessary additives
• No common irritants like alcohol or harsh preservatives
• Light, non-greasy texture reduces risk of pore congestion
• Patch test first if you have a history of sensitivity

Who is this for: Hydrance Boost Concentrated Hydrating Serum fits people with dry, dehydrated, or combination skin types who need a quick, non-greasy moisture boost that lasts through the day. It’s suitable for those who want a clean, mostly natural formula to strengthen the skin’s moisture balance and improve surface smoothness. If you prefer lightweight serums that layer well under creams and makeup and value controlled dosing from a dropper bottle, this product is a practical addition to your daily skincare routine.

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).