Biologique Recherche Serum Erythros eases the symptoms of redness-prone and rosacea-prone skin. This serum acts simultaneously on the causes of vascular dilation and the formation of new blood capillaries, calming inflammation and reducing visible redness. White Tea Leaf Extract is rich in catechins and polyphenols that protect the skin from environmental damage, reduce inflammation and soothe irritation, while supporting the vascular network against the fragility that causes visible flushing. Vitamin B3 (Niacinamide) acts on multiple fronts — reducing inflammation, improving the skin barrier and visibly diminishing redness and blotchiness over time. Kudzu Extract delivers targeted soothing and anti-inflammatory benefits by limiting the enzyme involved in inflammatory reactions, reducing capillary permeability and the appearance of diffuse redness at the skin's surface. Red Microalgae Extract and the Complex of Arnica Flowers, Solomon's Seal & Cypress Cones further soothe, tone and reinforce the skin's resistance to reactivity, resulting in a progressively calmer, clearer and more even complexion.