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You Need Vitamin D to Live. How Could This Woman Survive With None in Her Blood?

As Ebola Cases Rise in Congo, the W.H.O. Declines to Issue Emergency Declaration

Opioid Sales Reps Swarmed New York at Height of Crisis

You’re Covered in Fungi. How Does That Affect Your Health?

Gregg Gonsalves Blends Activism and Science

The Diagnosis Is Alzheimer’s. But That’s Probably Not the Only Problem.

Memorial Sloan Kettering Leaders Violated Conflict-of-Interest Rules, Report Finds

Mammogram Centers Must Tell Women if They Have Dense Breasts, F.D.A. Proposes

Bayer and Johnson & Johnson Settle Lawsuits Over Xarelto, a Blood Thinner, for $775 Million

Medicare for All Would Abolish Private Insurance. ‘There’s No Precedent in American History’

Ebola Epidemic in Congo Could Last Another Year, C.D.C. Director Warns

Methadone Helped Her Quit Heroin. Now She’s Suing U.S. Prisons to Allow the Treatment.

Tobacco, E-Cigarette Lobbyists Circle as F.D.A. Chief Exits

Flashing Lights and Sounds Improve Memory and Learning Skills in Mice

F.D.A. Moves to Restrict Flavored E-Cigarette Sales to Teenagers

National Cancer Chief Named as Acting Head of the F.D.A.

UnitedHealthcare Will Expand a Drug Discount Program Aimed at Lowering Consumer Costs

Pillsbury Flour, Nearly 500,000 Pounds, Is Recalled Over Salmonella Trace

Good News: Opioid Prescribing Fell. The Bad? Pain Patients Suffer, Doctors Say.

How to Quit Antidepressants: Very Slowly, Doctors Say