Get Fuller, Thicker Eyebrows in Just 6-8 Weeks | Are your eyebrows naturally sparse or too sparse? Either way, eyebrow serum M2 Beauté Eye Care can restore their natural fullness. Thanks to biotin and eunicella oil, it stimulates active and inactive roots. It promotes the natural growth of individual hairs, fills the eyebrows and visibly thickens them in 6-8 weeks.