Hair tonic is a product that can help with a variety of hair and scalp issues, including: Hydration: Hair tonics can hydrate the scalp and moisturize dry hair Shine: Hair tonics can make hair look glossier Breakage: Hair tonics can reduce breakage and split ends Volume: Hair tonics can add volume and texture to hair Styling: Hair tonics can help hold hair in place for easier styling Dandruff: Hair tonics can help control dandruff Hair growth: Hair tonics can stimulate hair growth by delivering nutrients to the scalp and hair follicles