This KISSHI Biotin Hair Growth Roll-On Massage Essence is formulated from natural extracts that are proven safe and gentle on your hair and scalp. Especially in this serum product, we have integrated triple roller structure. The triple-roller structure allows quicker and absorption along with gentle massage of the prone area to intensify the metabolism. The triple roller always rotates 360 degrees to provide a massage to your scalp. Scalp massage helps relax the scalp, relieve stress, and stimulate hair growth. The massage movements on the scalp stimulate blood vessels and increase blood circulation, allowing the hair roots to receive better nutrients and oxygen. This contributes to improving hair loss and stimulating hair growth. Designed to treat hair thinning, bald spots and repair brittle hair, the plant-based formula penetrates deep into scalp to stimulate blood circulation and growth of hair follicles. Regular use visibly increases hair density up to 87%! 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.