Many good food supplements available at a reasonable cost

They line up A-to-Z in grocery and health food stores, a dizzying array of supplements, vitamins and herbs with claims ranging from saving your heart to reducing your stress.

Many of the products target health concerns of seniors, yet some cost more per month than prescription drugs. What's worth buying?

"There's a huge amount of information out there, but people don't know who to trust," says Anu Singh-Cundy, an associate professor of biology at Western Washington University who studies plant biochemistry.