The Breakthrough Mist Spray Helping Restore Healthy Toenails Naturally. ProNail Complex is a uniquely formulated mist spray designed to support stronger, healthier-looking toenails — without harsh chemicals or complicated routines. Carefully crafted with powerful natural oils and skin-repairing vitamins, this advanced formula was developed to target the root of common nail issues. Unlike traditional creams or treatments, this doctor-formulated spray uses ultra-fine micro-particle technology to penetrate deep beneath the nail and skin surface — where the real problem begins. That means faster absorption, deeper action, and more effective results.