LiLash LiBrow Purified Eyebrow Serum XL conditions and fortifies hair follicles to give you fuller, thicker eyebrows. Thick, natural-looking brows are one of the most coveted attributes these days. They frame your face for a more youthful look. All you need is one thin coat during each application to really see results. Not even the damage from over-plucked brows can stop this formula from working.