Normal male total testosterone (T) levels range from 300-1000ng/dl and treatment is often prescribed for total testosterone levels below 350ng/nl.1,2
Nearly 500,000 new cases of low testosterone or "Low T" are expected per year in the US as the male population ages.3 Approximately 39% of men over the age of 45 have Low T (hypogonadism). Based upon this prevalence rate and the US Census Bureau's 2009 estimate that there are 48 million men between 45 and 75 years old, approximately 19 million men in the US may have Low T.4 Only 12% of the men with Low T receive testosterone replacement therapy according to a study published in Archives of Internal Medicine in 2008. Sales for male testosterone products in the US were $1.3 billion in 2010, with the market growing at double digits percentage rate annually.5
1 Cooper, Robert (January 21, 2010). Medline Plus. United States National Library of Medicine ; 2 Nieschlag E. Journal of Andrology (2006) ;
3 Journal of Clinical Endocrinology and Metabolism, 2004 ; 4 International Journal of Clinical Practice, 2006 ; 5 IMS
