TimeTeller puts our internal clocks at the center of personalized medicine

At-home health testing has been mired in overblown claims and outright fraud. But German startup TimeTeller, which has developed a saliva test kit to help anyone understand their circadian rhythm, is led by CEO Angela Relógio, who is the polar opposite of Theranos’ disgraced founder Elizabeth Holmes.

Relógio is a physicist-engineer and molecular biologist who spent years researching oncology, circadian biology, and systems medicine in Germany before leaving academia to build TimeTeller. She is careful about what the test can…