A prospective, uncontrolled, non-pharmacological interventional study conducted on men with functional or borderline hypogonadism, aimed at evaluating, after 3 months of supplementation with D-Chiro-inositol, changes in hormonal profile and sexual function.

The study involves the recruitment of 35 functional hypogonadal patients aged between 50 and 75 years to the Andrology Unit of the "Antonio Cardarelli" Hospital. At T0 patients will undergo hematochemical evaluation of the following parameters: total and free testosterone, PSA and hematocrit.

At the same time, they will be provided with a self-assessment questionnaire on physical and sexual functioning. The same evaluations will be performed after 3 months of supplementation (T1).

The main endpoint is the intra-subject variation in total and free testosterone levels between T0 and T1.

Inclusion Criteria:

• Men aged between 50 and 75
• Affected by functional hypogonadism associated with male aging

Exclusion Criteria:

• Elevated ferritin, PRL, and/or elevated CRP values; diagnosis of primary hypogonadism; diagnosis of organic hypogonadotropic hypogonadism or secondary to other ongoing acute or chronic pathologies; presence of other pituitary deficits.
• Alcohol use and/or drug abuse, recent hormone treatment, smoking, systemic or endocrine diseases, infection of the male accessory glands, medical history of cryptorchidism or varicocele, and micro-orchidism.