Alum stone Effective and long-lasting protection. Made with potassium alum, a powerful natural mineral that reduces the proliferation of odor-causing bacteria. Topical use. Especially suitable for sensitive skin. Does not stain skin or clothing. Suitable for vegans. Natural freshness sensation Does not mask bad odors, acts before they develop Warnings: Keep out of reach of children. Do not ingest. If irritation occurs, discontinue use. Do not use on damaged skin. The crystal may break if dropped. For external use only.