Advocates of black seed oil for hair suggest that these properties can help maintain scalp health by addressing issues such as dandruff while keeping the scalp moisturized.Proponents claim that hibiscus can also help:stop hair lossmake your hair look healthy and lustrousprevent premature grayingthicken hair and add volumetreat dandruffcondition against frizz, dryness, and breakageprevent split ends