2.1. Participant recruitment

Consumers were purposively sampled from Genioz online survey respondents (Figure 1). ²⁰ Survey respondents who indicated they would be prepared to be interviewed were sent an email. Given that survey respondents self‐selected the type of test they had pursued, screening calls took place to confirm eligibility. It became apparent that many potential interviewees had pursued single gene testing for MTHFR only. Therefore, as recruitment and data collection continued, additional individuals who had undergone testing for this gene only were excluded to ensure all aspects of the data set were well captured. ²²

Consumer recruitment

Specific HPs working in private practice were identified as those who do or could offer nutrigenomic testing (informed by findings of the Genioz study). ²⁰ CAM (naturopathy, nutrition, integrative medicine) and allied health (dietetics, pharmacy and private genetic counselling) practitioners were recruited via four methods: purposive sampling after an online search to identify key individuals; random sampling through advertisements placed in practitioner‐specific professional society e‐newsletters; convenience sampling through professional research networks; and snowballing sampling through interviewee networks. Invitation letters were emailed, to which interested practitioners responded directly to the researcher.