Bub is a bath product line developed by Kao Corporation, a leading Japanese company specializing in personal care and household products. The Bub range includes effervescent bath tablets designed to enhance the bathing experience by releasing carbon dioxide when added to warm water. This carbonation intensifies the warming effect, promoting improved blood circulation and providing relief from fatigue, stiff shoulders, and back pain. 

Each Bub tablet is infused with various scents, such as Eucalyptus, Hinoki Cypress, and Rose Harmony, offering a therapeutic and aromatic bathing experience. The tablets dissolve completely, leaving the bathwater with a subtle fragrance and a milky appearance, contributing to a relaxing and rejuvenating soak.