Women's fertility can be given a boost through "kiss" therapy, a study has revealed.
Experts have discovered that the kisspeptin hormone, made by the "KISS-1" gene, could help fertility and ovulation.
Kisspeptin controls the distribution of sex hormones, which are responsible for the menstrual cycle.
Scientists now believe that the research could provide the key to a new type of fertility treatment for women who have low levels of sex hormones.
A shortage of kisspeptin in both humans and animals means they do not go through puberty and are sexually immature.
Ten women who were infertile and were not menstruating were monitored by Dr Waljit Dhillo and colleagues from Imperial College London.
The women received injections of either an inactive salt solution or kisspeptin. Blood samples were taken to check levels of follicle stimulating hormone (FSH) and luteinising hormone (LH), both of which are vital for fertility and ovulation.
The findings showed that kisspeptin resulted in a 48-fold rise in LH and a 16-fold rise in FSH when compared against the inactive salt solution.