Can children use the shampoo bar? 16 January 2023 18:38 Updated Our shampoo bar has been tested for use on adult hair only. Related articles Does a shampoo bar work as well as liquid shampoo? How can I travel with a shampoo bar? What do I do if the shampoo bar goes in my eyes? Will I need to wash my hair more frequently with a shampoo bar? Are the shampoo bars suitable for nut allergy sufferers?