Trial information

Who can participate?

You are likely to be eligible for the trial if:

  • You live in Canterbury
  • You are between the ages of 18-65
  • You are experiencing symptoms of anxiety and/or depression that are getting in the way of your life
  • You are not currently taking medication for any mental health issues

The full inclusion and exclusion criteria can be found under the Information for General Practitioners tab on this website.

What is a randomised controlled trial (RCT)?

This randomised controlled trial is exploring whether or not multi-nutrients may improve symptoms of anxiety and depression in adults. The RCT is viewed as the gold standard for testing whether or not treatments work. Participants will be randomly assigned to one of two groups, either the treatment group (who will receive multi-nutrients) or the placebo group (who will receive an identical product that contains no multi-nutrients). Both groups will take placebo or multi-nutrients for 10 weeks.

Neither the participant NOR the investigators will know which group participants are in until the end of the study. However, at the end of the RCT phase (after 10 weeks), ALL participants will be offered the opportunity to take the multi-nutrients for a further 10 weeks, regardless of which group they were in. That way, everyone who participates in the study has the chance to try the multi-nutrient intervention.

Multi-nutrients are not a proven treatment for symptoms of anxiety and depression. For more information about treatments for symptoms of anxiety and depression, please speak to your GP or mental health professional.

The trial has been prospectively registered under the Australian and New Zealand Clinical Trials Registry. Trial Identification = ACTRN12617001647325. Universal Trial Number = U111111994026. Ethics approval was granted through the New Zealand Heath and Disability Ethics Committee 17/STH/131 on 14 November 2017 and the University of Canterbury Human Ethics Committee: HEC2017/108/LR, on 27 November 2017.

Once completed, the results of the trial will be published in a peer-reviewed scientific journal. Participants will not be individually identified and their privacy will be protected.

What does participation in the trial involve?

You will decide if you may be suitable to participate in this study. We would recommend you discuss your choice to participate with your GP as there are a number of reasons that you might not be able to participate, for example taking additional medications which have interactions with the multi-nutrients. Either you or your GP can make a referral on your behalf to the study. The principal investigator will get in touch with you and will ask you come back to this website where you will create a unique, confidential and secure log-in. You will then be asked to complete a series of questionnaires about your mental health, your general wellbeing and information about your life more generally (e.g. work, education). The questionnaires will take between 30 to 40 minutes approximately to complete. During the study, you will complete this series of questionnaires up to 4 times. After you have completed these questionnaires, the principal investigator will then ring you to discuss the study, ask some final questions and further assess whether or not you will be able to participate in the study. Once you and the principal investigator have established that you are eligible to participate, you will be asked to provide written consent for the study.

Your GP will be contacted to let them know whether or not you are eligible for and decided to participate in the study. This is to ensure your safety and to make sure you have the best access to suitable treatment and support. Your GP will have the ability to withdraw you from the study at any time if they think participating may not be appropriate for you.

Once you have completed the questionnaires on the website, you will then start two weeks of monitoring your overall levels of anxiety, depression, stress and if you think your ability to function is improving or declining. These monitoring questionnaires will be completed on this website, using your unique and confidential log-in.The monitoring questionnaires will take approximately 10 minutes. You will not take either the multi-nutrients or placebo during this baseline period. The purpose of these two weeks is to provide a baseline of your symptoms. We can then measure any change during the next part of the trial against these first two weeks.

At the end of the two weeks, you will start the RCT phase of the trial, whereby you will take either multi-nutrients or placebo. You will be asked to take up to 12 pills a day and complete the same weekly monitoring questionnaires.

At the end of the RCT phase (10 weeks), you will be offered the chance to take the multi-nutrients for a further 10 weeks (called an “open label” phase).

Regardless of whether you participate in the open label phase, you will be contacted again 1 year after the baseline monitoring period to complete further online questionnaires. We call this a follow up and it helps us understand if multi-nutrients help people over a longer period of time.

Participation in this study will not incur any costs to you. The multi-nutrient and placebo product will be provided to you free of charge. After you have completed the study, you will not receive any further funded multi-nutrients. If you wish to purchase the multi-nutrients, we will assist you to do so at your own cost. The company who provide the multi-nutrient product donate the multi-nutrient product and placebo to the trial. They have no further involvement in the trial, data collection, analysis of results or any subsequent publications. The investigators in the trial have no financial involvement in the company that donate the products to this trial.

If you have any questions or concerns about your mental health or treatment for a mental health issue, please speak to your General Practitioner. Referrals to participate in the study can only be made through self-referral or by your GP. 

Principal Investigator:

Meredith Blampied

Registered Clinical Psychologist, PhD Student


Postgraduate Diploma in Clinical Psychology  (University of Canterbury)

Master of Science Psychology (Distinction) (University of Canterbury)

Bachelor of Arts with Honours (First Class Honours) (University of Canterbury)

Research interest/experience:

Meredith’s research interests include investigating the role of nutrition in mental health,  exploring feedback-informed treatment and best-evidence practice for anxiety disorders, particularly obsessive compulsive disorder. She is also involved in ongoing research on the impact of the Canterbury earthquakes on an anxious population. Meredith has also worked on a number of research project in the areas of child development and learning and social psychology. Meredith has had experience working with adults experiencing a range of mental health issues including anxiety disorders, depression, substance abuse and dependence, adjustment, stress and offending behaviours.


Professor Julia Rucklidge

Registered Clinical Psychologist


Bachelor of Science (McGill University)

Master of Science (University of Calgary)

Doctor of Philosophy (University of Calgary)

Research interest/experience:

Julia’s research interests are centered on the role of nutrition in the expression and treatment of mental illness, from ADHD to depression, to stress following natural disasters. Research methodologies include single case research designs, open label trials and randomised controlled trials. She also has clinical interest and experience in the areas of ADHD, child and adolescent clinical psychology, learning disabilities, youth offending, earthquake research, nutritional interventions, mood disorders.

Additional Research Team Members:

Dr Caroline Bell (Psychiatrist, University of Otago)

Claire Gilbert (Anxiety Disorders Service, Canterbury District Health Board)

Associate Professor Joseph Boden (University of Otago). Assoc. Professor Boden is providing statistical support for the study.

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