"Penis enlargement pills", "penis patches" or ointments are commonly offered over the Internet. This is one of the most common topics for spam email messages. Analyses performed by Flora Research of California and by the University of Maryland have uncovered harmful contaminants in a number of "penis enlargement" pills. Contaminants found included mold, yeast, dangerous E. coli bacteria, pesticides, and lead. Dr. Michael Donnenberg of the University of Maryland has described herbal pills marketed as having "heavy fecal contamination", possibly from animals grazing near the plants harvested for herbal ingredients.
In discussing a typical "male enhancement" pill, Dr. Ira Sharlip, a spokesman for the American Urological Association, said "There is no such thing as a penis pill that works. These are all things that are sold for profit. There's no science or substance behind them."