In the 1980s, Danone researchers took interest in bifidobacteria. They developed a specific strain that can survive in the acidic medium of yogurt. In addition to traditional yogurt bacteria, they decided to add a probiotic strain. Activia products thus contain "Bifidobacterium animalis DN 173,010", a proprietary strain of Bifidobacterium, a probiotic which is marketed by Dannon under the trade names "Bifidus Regularis", "Bifidus Actiregularis", "Bifidus Digestivum" and "Bifidobacterium Lactis". Danone launched Activia in France in 1987 under the "Bio" brand name. The claims of health benefits have led to lawsuits in the European Union, Canada and the United States, all of which have resulted in Danone's having to modify their advertisement and paying compensations to customers.