Minoxidil, the active ingredient in Oveallgo ScalpRevive, works by widening blood vessels and opening potassium channels, which helps to increase blood flow and nutrient delivery to hair follicles. This increased blood flow can help stimulate hair growth and improve the thickness and density of existing hair. The Oveallgo ScalpRevive rollerball applicator ensures that the Minoxidil is precisely delivered to the scalp where it is needed most. Oveallgo ScalpRevive Minoxidil Growth Roller nourish and moisturize the scalp, which can help to promote healthy hair growth. A healthy scalp provides a good foundation for hair growth and can help to prevent hair from becoming brittle or breaking. This is why Oveallgo ScalpRevive Minoxidil Growth Roller is special OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.