A lack of sex drive and erectile dysfunction may be a result of low testosterone levels in men over 30, according to new research.

The research found that one out of four men over 30 have low testosterone levels, and one out of every 20 men have clinical symptoms linked to a deficiency, according to a study by the New England Research Institute.

Researchers analyzed almost 1,500 men enrolled in the Boston Area Community Health Survey, aged 30 to 79 years and compiled data on the volunteers’ testosterone, symptoms of hormone deficiency, and medications that may impact sex hormone levels.

Low testoterone can indicate an androgen deficiency if it is accompanied by low sex drive, erectile dysfunction, osteoporosis or fracture, and two or more of the following: sleep disturbance, depressed mood, lethargy or diminished physical performance.

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