The New Generation Purola Overnight Formula is one of the most significant developments to date in the thinning hair and hair care field. It contains the exact formula developed by Dr. Purola in her research studies conducted at the University of Helsinki in Finland and provides the hair follicles with the deepest cleaning possible. Before bed, apply The Purola Overnight Formula directly to your scalp using the calibrated dropper paying particular attention to the areas that need it most.