Spectral.LASH + Spectral.BROW Spectral.LASH is topical care designed to treat deficiencies in length, quality, and density of eyelashes. A clinically-tested dermatological treatment that utilizes the most innovative advances in biotechnology for eyelash growth; this is a revolutionary formula that delivers thick, beautiful lashes. Spectral.BROW is designed to stimulate eyebrow growth. Spectral.BROW not only enhances the appearance of thickness, but it also improves the health and quality of the hairs that grow. Spectral.BROW leverages DS Laboratories’ proprietary ingredient Nanoxidil®, which we specifically designed to stimulate hair growth, without the negative side-effects of Minoxidil.