Is an Anti-Aging Pill on the Horizon?

Anti-aging products from skin creams to chemical peels are part of a $250 billion industry, but scientists have yet to discover a longevity elixir that stands up to medical scrutiny. A group of researchers believe they're getting closer, however, thanks to a compound called nicotinamide adenine dinucleotide, or NAD+ for short.

"NAD+ is the closest we've gotten to a fountain of youth," says David Sinclair, co-director of the Paul F. Glenn Center for the Biology of Aging at Harvard Medical School.