What is the purpose of a hair tonic?

The purpose of a hair tonic primarily lies in its ability to invigorate the scalp and promote healthy hair growth. Hair tonics often contain various ingredients designed to stimulate blood circulation in the scalp, which can help nourish hair follicles and encourage new hair growth. These tonics may also include natural extracts, vitamins, and minerals that can support overall scalp health, making it conducive to fostering stronger and healthier hair.

While other products might specifically aim to increase volume, nourish hair for styling, or protect against environmental damage, the distinguishing focus of hair tonics is their role in enhancing the scalp's condition, ensuring that hair has the best possible environment for growth. Each of these other choices describes benefits that contribute to hair aesthetics or protection, but they do not directly address the primary function of promoting hair growth through scalp stimulation as effectively as the selected answer.