What is the meaning of one vial scalp concentrate?

A vial is a small glass container that is sealed with a rubber stopper. It is often used to store and dispense liquids, such as medications. A scalp concentrate is a hair care product that is typically applied to the scalp to nourish the hair and promote hair growth. One vial scalp concentrate refers to a single vial of scalp concentrate, which may contain enough product for one or more applications.