|These {products|merchandise} {usually|often|normally} {contain|include|comprise} {vitamins|nutritional vitamins}, minerals, herbs or hormones that {claim|declare} to enlarge the penis. Despite their {impressive|spectacular} claims, there's {absolutely|completely} no {clinical|medical|scientific} {evidence|proof} that these {products|merchandise} work {and some|and a few} {may|might|could} even be {harmful|dangerous}. The University of Maryland {in the|within the} US carried out an {analysis|evaluation} on {some of these|a few of these} {and found|and located} traces of lead, pesticides, E.}