Study to Compare DITEST to Testosterone Undecanoate in Adult Men With Hypogonadism

Inclusion Criteria: * Male subjects aged 18 to 80 years. * Diagnosis of primary testicular failure or secondary hypogonadism due to known pituitary disease or congenital deficit. * Body mass index (BMI) \>18kg/m2 and \<35kg/m2 * Testosterone level \<8nmol/L after washout of current testosterone treatment, if applicable. * Normal prostate specific antigen (PSA) levels based on the age of the subject. * Provision of written informed consent and able to participate in the study and abide by the study restrictions. Exclusion Criteria: * Subjects with a past history of, or current prostate cancer, male breast cancer or hepatic neoplasm. * Subjects with a history of or current myocardial infarction (MI), unstable cardiovascular disease, or clinically relevant findings on the screening electrocardiogram (ECG) (as determined by the investigator) * Subjects with a history of or current alcohol abuse (consumption of more than 28 units per weekweek: 1 unit equals 25mL single measure of whisky (ABV 40%), a third of a pint of beer (ABV 5-6%) or half a standard (175 mL) glass of red wine (ABV 12%). * Subjects with other unstable or inadequately treated endocrine conditions. * Haematocrit levels \>0.5 at baseline * Subjects with poor dental hygiene that would interfere with the collection of saliva samples or contaminate them with blood. * Subjects with any severe co-morbidity or with any significant medical or psychiatric conditions that in the opinion of the investigator would preclude…