Kirkland Minoxidil oil is for those who wish to grow their bald head or who wants to grow more beard faster. Using it with the derma roller speeds up the growth rate. The derma roller is a micro needle which when rolled on the skin, removes dirt and increases the pore size on the skin where the Kirkland Minoxidil oil will be applied. Ladies can also use the derma roller if they want a faster result when using any skin product on the skin