When skin is dehydrated, it can feel tight, uncomfortable, have small flakes, and appear dull. Dehydration can affect any skin type, even oily, combination, or sensitive skin. Bioderma Hydrabio Serum 40 ml was developed to specifically address the skin's lack of water, providing immediate and long-lasting hydration and helping to strengthen the skin barrier function. Its formula combines high molecular weight hyaluronic acid and glycerin, ingredients that help capture and retain water on the skin's surface, with the patented Aquagenium+ technology, developed to stimulate natural hydration mechanisms and improve water circulation in the skin. It also contains niacinamide, which contributes to the synthesis of skin lipids and, consequently, to the strengthening of the skin barrier, and prebiotic sugars that help maintain a healthy skin microbiome. According to Bioderma, the serum provides +176% immediate hydration and hydration for 72 hours, based on instrumental measurements performed on small groups of volunteers. The gel texture is fresh, light, non-greasy and non-sticky, making it suitable for teenagers and adults and all skin types. It is also non-comedogenic and alcohol-free and can be used as a prep step before moisturizing.