Federal prosecutors in California are in the early stages of conducting a criminal investigation into Juul Labs. The company is also facing federal and state probes into the marketing of its vaping products. (Wall Street Journal)

A polling firm linked to former Vice President Joe Biden is testing messages that undercut Democratic rivals’ support for “Medicare for all.” Research has found that a majority of Democrats are in favor of government-run healthcare, but support recedes after voters are told of the cost. (Bloomberg)

Novo Nordisk is looking to expand its grip on and transform the diabetes market after its pill Rybelsus was approved by U.S. authorities last week. Although seven in 10 U.S. diabetes prescriptions are for oral treatments, none are for the class in which the company specializes. (Reuters)

Humana has hired 75 developers in Boston in the past half-year for its new digital hub. Staffers are working on projects including a virtual primary care service with the telemedicine platform Dr. on Demand with eyes on a 2020 launch for small business plans. (CNBC)

The recall of blood pressure treatment losartan has been expanded for the fifth time, prompted by Torrent Pharmaceuticals finding an impurity in batches of the drug. The batches contained levels of carcinogen NMBA above recommended daily intake levels. (USA Today)