wow Type: Hair Oil Suitable For: All Skin Type Within 6-8 business days However, to find out an actual date of delivery, please enter your pin code. Get strong and lustrous hair with WOW Skin Science Onion Black Seed Hair Oil. This hair oil works to condition your weak strands and moisturize your scalp. Light, non-sticky hair oil can be used on very curly and dry strands after shampoo as a serum and hair protector. Regular use helps to improve hair texture and strengthen the strands.