Finding out whether you're at high risk of developing Alzheimer's disease or migraines may become more challenging, at least if you want to do it yourself. The FDA warned 23andMe, a leading genetic-testing company that sells services directly to consumers, that its products need the agency's approval to stay on the market.
With just a bit of spit, companies like 23andMe, co-founded by Anne Wojcicki and backed by Google, provide a wealth of information about genetic makeup, from an individual's risk of developing cancer to the ability to respond to drugs like the blood-thinning medication warfarin. (The company also provides a...