Health Canada has issued a new health warning, following previous voluntary product recalls in the US, Australia and UK, against the use of 6 supplements, 4 of which are male sexual performance enhancement drugs, which may contain undeclared and possibly dangerously high amounts of sulfosildenafil and sulfohomosildenafil, which are analogs of sildenafil (Viagra): http://www2.canada.com/topics/news/national/story.html?id=5095895
