Rows and rows of vitamins and herbal supplements line the shelves of drug, discount and grocery stores-- each bottle promising some sort of improvement.

Multi-vitamins, single-vitamins, St. John's Wort, Ginko Biloba, garlic, kava, soy, ginger are just some of the supplements claiming to overcome problems like nutrition deficiencies, pain, memory loss and weight gain.

But do they do what they claim to do? Are they safe?

Austin Medical Center pharmacist Rick Knoll shares his knowledge of supplements and offers tips on how to determine which claims are real and what products are safe in the 'Living' section.