Probiotics for Hay Fever Trial – Expressions of Interest

We are seeking Expressions of Interest for participation in the Probiotics for Hay Fever Trial.

NIIM is undertaking a clinical research trial investigating the effect of probiotic supplements on hay fever (seasonal allergic rhinitis).

Participants must be:

  • aged 18-65 years old;
  • have a history of hay fever or seasonal allergic rhinoconjunctivitis during the spring/summer peak season in Australia (Nov/ Dec);
  • are able to visit the NIIM clinic in Melbourne, VIC.

A randomised double-blind placebo-controlled parallel trial of 12 weeks duration investigating the efficacy of a probiotic formulation on reducing symptoms of seasonal allergic rhinitis.

Participation will involve:

  • Taking a probiotic supplement for 12 weeks starting in the month prior to peak season (Oct) and during peak season (Nov/ Dec);
  • daily recording of symptoms and medication use in a supplied questionnaire diary;
  • blood and stool tests at the start and end of the trial.

Update 5 Oct 20: Recruitment for the trial has commenced.

  • All eligible participants go into the running to win one of four $250 gift cards.
  • Don’t have hay fever but know someone who does?
  • Refer an eligible friend and we will send you a referral $50 gift card to say thank you! Just make sure they provide your details when they register so you don’t miss out*.
    * limited to the first 50 referrals

For more Information and Expressions of Interest:

or email directly to: / Subject heading: Hayfever Trial 


To assess eligibility, we require you to fill in an online questionnaire asking you to reflect on your symptoms and impact on your quality of life during the last years’ hayfever seasons.