He tells us that Just For Men, unlike traditional hair dyes, slowly deposits small amounts of pigments to the hair over time. "So long as the product does not come in contact with the eyes, it should be safe to use on the eyebrows," he says. "However, it is designed to be used as a short contact treatment in the form of a shampoo and should not be left on the skin for extended periods of time as it may cause irritation."