益力多（香港及广东译益力多，**及中国大陆其他地区译养乐多，新加坡译益多，日文名称：ヤクルト，英文：Yakult），是一种活性乳酸菌饮品，因日本京都大学医学部的微生物学教授代田稔于1930年成功培养出对人体肠道有益健康的乳酸菌，其后以其名字命名为「代田菌」（学名：Lactobacillus casei strain Shirota），并于1935年开始生产及销售益力多产品。

「Yakult」这个名称是取自世界语的「Jahurto」，意即奶酪。

益力多饮品由日本益力多企业 － 株式会社ヤクルト本社（Yakult Honsha Co., Ltd.）生产，公司同时拥有日本职业棒球的东京养乐多燕子棒球队。

Yakult(ヤクルト,Yakuruto) is a probiotic dairy product made by fermenting a mixture of skimmed milk with a special strain of the bacterium Lactobacillus casei Shirota. It was created by Japanese scientist Minoru Shirota, who graduated from the Medical School of Kyoto University in 1930. In 1935, he started manufacturing and selling Yakult. Official claims state that the name is derived from jahurto, an Esperanto word for "yogurt". Since then, Yakult has also introduced a line of beverages for the Japanese market that contain Bifidobacterium breve bacteria, and has also used its lactobacilli research to develop cosmetics. More recently, the Yakult Honsha played a major role in developing the chemotherapy drug irinotecan (Camptosar, CPT-11).