Introduction: Add-ons for assisted reproductive technology: can we be honest here?

Adjuncts, more often known as add-ons, are now part of the landscape of an in vitro fertilization cycle. Since the early days of in vitro fertilization, fertility services have rightly been seeking improved success rates. At present there are a multitude of choices for patients who are usually presented with a menu of add-ons to choose from. This is driven by the desire to give patients the best chances of becoming parents. This Views and Reviews series discusses all aspects of add-ons. It is not exhaustive as even as we are finishing the preparation of the series, there is a new study about the use of cytokines as an add-on. The overall conclusion from this series of articles is that despite considerable efforts to establish benefits with add-ons that there is a paucity of data when we consider the outcome of live birth.