Background
In vitro fertilisation (IVF) ‘add‐ons’ are extra (non‐essential) procedures, techniques or medicines, which usually claim to increase the chance of a successful IVF outcome. Use of IVF add‐ons is believed to be widespread in many settings; however, information about add‐on availability in Australasia is lacking.

Aims
To understand which add‐ons are advertised on Australasian IVF clinic websites, and what is the evidence for their benefit.

Materials and Methods
A systematic assessment of website content was undertaken between December 2019–April 2020, capturing IVF add‐ons advertised, including costs, claims of benefit, statements of risk or limitations, and evidence of effectiveness for improving live birth and pregnancy. A literature review assessed the strength and quality of evidence for each add‐on.

Results
Of the 40 included IVF clinics websites, 31 (78%) listed one or more IVF add‐ons. A total of 21 different add‐ons or add‐on groups were identified, the most common being preimplantation genetic testing for aneuploidies (offered by 63% of clinics), time‐lapse systems (33%) and assisted hatching (28%). In most cases (77%), descriptions of the IVF add‐ons were accompanied by claims of benefit. Most claims (90%) were not quantified and very few referenced scientific publications to support the claims (9.8%). None of the add‐ons were supported by high‐quality evidence of benefit for pregnancy or live birth rates. The cost of IVF add‐ons varied from $0 to $3700 (AUD/NZD).

Conclusions
There is widespread advertising of add‐ons on IVF clinic websites, which report benefits for add‐ons that are not supported by high‐quality evidence.