David Andrews, a 58 year old father of three, endured for years the symptoms of Testosterone Deficiency, which he believes stemmed from surgery he underwent as a 19 year old.
Dr Dan Hegarty, 55, an occupational health physician from Chislehurst, Kent, was just 41 when he began suffering from the male menopause.
Former fishing boat skipper Ian McDonald believes that Testosterone Replacement Therapy (TRT) could well have saved his life.
Reg was in his mid-forties when he started feeling irritable. Five years later he felt like a zombie - tests showed he had the testosterone level of a 70 year old man.