Eucalyptus, the weight loss start-up that has become one of the country’s biggest health companies, is being sold to New York-listed obesity drugs giant Hims & Hers Health for more than $1.6 billion, in a major payday for its 35-year-old co-founder and venture funds.

San Francisco-based Hims & Hers said late on Thursday that it would acquire the seven-year-old Australian company, which runs popular weight-loss brands Pilot and Juniper as well as a fertility service known as Kin, in an all-cash deal that would turn Eucalyptus into its international division.

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