50ml Onion Hair Serum is a product derived from onion extract or onion oil that is used to promote hair growth, reduce hair fall, and improve overall hair health. The serum typically contains other ingredients such as vitamins, minerals, and essential oils that further nourish the hair and scalp. Regular use of onion hair serum may help improve the strength, thickness, and overall condition of the hair. Onions are rich in sulfur, which is known to stimulate hair follicles, increase blood circulation to the scalp, and promote hair growth. 50ml Onion Hair Serum includes biotin, vitamin E, argan oil, castor oil, and coconut oil.