From MSNBC:

Lead in ginkgo pills. Arsenic in herbals. Bugs in a baby’s colic and teething syrup. Toxic metals and parasites are part of nature, and all of these have been found in “natural” products and dietary supplements in recent years.

Set aside the issue of whether vitamin and herbal supplements do any good.

Are they safe? Is what’s on the label really what’s in the bottle? Tests by researchers and private labs suggest the answer sometimes is no.