The Biologique Recherche Expert Eyes Lash and Brow Serum is an advanced double-serum treatment formulated to strengthen, nourish and densify eyelashes and eyebrows, delivering visible improvements in length and density within 14 to 28 days. Serum No. 1 is applied to the roots, Serum No. 2 through the lengths. Serum No. 1 contains the Pea Extract and Sucrose Dilaurate Complex, which stimulates dermal papilla cells to support hair regrowth and reduce shedding, while also regulating melanin production at the follicle level for a more even-toned lash and brow line. Resveratrol provides potent antioxidant protection against oxidative damage at the follicle, preserving follicle integrity and supporting denser, stronger growth, while Biomimetic Peptide and Red Clover Extract minimise hair loss by stabilising DHT levels and normalising hair growth cycles. Serum No. 2 contains Abyssinian Oil — rich in omega fatty acids — which nourishes and reinforces the cuticle layer, reduces breakage and protects against environmental damage. Rep'Hair (Vegetable Protein) penetrates deeply into weakened hair fibres to repair protein bonds, restore elasticity and strengthen from within — together delivering visibly fuller, longer and more resilient lashes and brows.