Yakult is a probiotic drink popular in many countries. It is a mixture of milk and fermented bacteria that supports good digestive health. The word 'yakult' is actually a brand name, which is why there are not many synonyms for it. However, there are other probiotic drinks that can be used as an alternative, such as kefir, kombucha, and lassi. These drinks also contain beneficial bacteria that can help balance the gut microbiome and improve digestion. Each drink has its own unique flavor, so it's worth trying them all to find the perfect match for your taste buds.