Advertisement Most women undergoing IVF are using add-on therapies for which there is no proof they will work, and researchers have warned couples the money would be better spent on more cycles of IVF. National research to be published in the journal, Human Reproduction, on Tuesday found 82 per cent of women had used one or more add-ons with IVF in the past four years. Most add-ons (72 per cent) cost extra, some up to $700 per cycle. Pharmacist Diane Kwok with sons Isaac, three, and Tobias, one. Credit:Wayne Taylor Monash University researcher Dr Karin Hammarberg said given there was no evidence to show any add-ons worked, nor that they were free of harm, it was difficult to justify them.