Men above the age of 40 can now heave a sigh of relief after the discovery of Nebido, a testosterone replacement injection therapy to prolong sexual desires of men.

According to research, a man above 40 will start develop mood swings similar to women during their menopausal period. This may lead to low level of testosterone which decreases sexual desire to men and may cause health risks.

A testosterone is the sex hormone secreted by the testes that stimulates the development of male sex organs, secondary sexual traits, and sperm.

A male usually suffers testosterone deficiency or hypogonadism in medical terms. If left untreated, this may caused health problems to men such as diabetes, heart disease or worse Alzheimer's disease.

Study shows that a male sex hormone decreases by one percent when a man hits the age of 40.

Health Sciences Authority in Singapore has recently tested and started giving Nebido prescription, the world's first testosterone replacement injection therapy.

This new product would be maintained in the blood for about three months and thus requires only four doses per year unlike the old method, which lasted for only three weeks.

According to its maker Bayer Schering Pharma, it produces consistent level of testosterone in the blood.

Professor Farid Saad, head of Bayer's global scientific affairs said, "With conventional therapies, after injection, testosterone levels increase to levels higher than normal, followed by a rapid decline to hypogonadal level within two weeks."

"This wide variation in serum testosterone levels ? described as a roller-coaster effect produces unwanted fluctuation in mood, energy, libido and sexual function," he added.

All of these with 100 percent satisfaction guaranteed with improved health and a promise of physically fit body, each Nebido costs $300 per jab, 600 percent increase from conventional method which costs $50 per injection.