Fertility experts have called for IVF clinics to limit the use of drugs to stimulate the production of eggs. In a study in the journal Human Reproduction, researchers emphasized the benefits of using the woman's natural cycle in most cases.

The team from the Assisted Conception Unit at King's College Hospital, London, reported that in 60 – 70% of cases, a series of treatment cycles without using ovarian stimulation would be safer, less stressful and result in fewer multiple births. They also point out that it would cost only a fifth of the price of current practices. The study involved 181 natural treatment cycles in 52 women. They were found to have the same chance of becoming pregnant after an average of three to four cycles of treatment as women undergoing conventional drug-stimulated treatment.

Geeta Nargund, who led the study, admitted that for women who don't ovulate or who...

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