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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Type of registration
Prospectively registered

Titles & IDs
Public title
Can a proprietary spearmint extract improve cognitive function?
Scientific title
A Randomized, Double-Blind, Placebo-Controlled, Parallel Trial Investigating a Proprietary Spearmint Extract on cognitive function in healthy individuals.
Secondary ID [1] 286038 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Cognitive function 294013 0
Condition category
Condition code
Alternative and Complementary Medicine 294314 294314 0 0
Other alternative and complementary medicine
Mental Health 294994 294994 0 0
Studies of normal psychology, cognitive function and behaviour

Study type
Description of intervention(s) / exposure
This study is a randomised, double-blind, placebo-controlled, parallel intervention trial. A total of 128 individuals aged 50 to 70 years will take part in the study with an intervention period of 90 days.

Participants will be required to complete four testing sessions (day 0, day 7, day 30 and day 90), and one screening session. At each session participants will be required to complete a series of measures assessing cognitive function.

Following visit 1 participants will be randomly allocated to receive one of the two treatments (administered in capsules)

- Proprietary spearmint extract (900 mg/day)
- Matched placebo (of microcrystalline cellulose)

The study product (two capsules) will be administered orally (self-administered at home) daily for 90 days. Compliance will be assessed by capsule count at each study visit.
Intervention code [1] 291024 0
Intervention code [2] 291025 0
Treatment: Other
Comparator / control treatment
Matched placebo (microcrystalline cellulose)
Control group

Primary outcome [1] 294118 0
Cognitive function as assessed by the COMPASS cognitive assessment battery. The assessment battery includes tasks that assess attention, working memory, episodic memory and executive function domains.
Timepoint [1] 294118 0
Day 1 (visit 1)
Day 30 (visit 3)
Day 90 (visit 4)
Secondary outcome [1] 312539 0
Measures of general health as assessed by the following questionnaires:

- Profile of Mood States (POMS)
- Leeds Sleep Evaluation Questionnaire (LSEQ)
- Everyday Memory Questionnaire (EMQ)
- Quality of Life Index (QLI)
Timepoint [1] 312539 0
Day 1 (Visit 1)
Day 7 (Visit 2)
Day 30 (Visit 3)
Day 90 (Visit 4)
Secondary outcome [2] 312645 0
Biomarkers of oxidative stress as assessed by serum analysis.
Timepoint [2] 312645 0
Screening Visit
Day 90 (Visit 4)

Key inclusion criteria
People who meet the following inclusion criteria will be included in the trial:

- Male or female, aged 50 to 70 years, inclusive.
- Willing and able to provide written informed consent.
- Understands and is willing and able to comply with all study procedures.
- Fluent in written and spoken English.
- Are in good general health as judged by the Investigator on the basis of medical history and biochemical assessment.
Minimum age
50 Years
Maximum age
70 Years
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
Participants who display any of the following will be excluded from the trial:

- Participant is unable to understand and/or perform required tests according to the practice test results.
- Participant has a history of repeated minor head injury (e.g., in boxing) or a single injury resulting in a period of unconsciousness for 1 h or more.
- Subject has a history or presence of cancer in the prior 2 years, except for non-melanoma skin cancer.
- Subject has an active infection or signs/symptoms of an infection at clinic visit. Clinic visits will be rescheduled to allow subject to be symptom-free of any type of systemic infection for at least 5 days.
- Subject has recently used antibiotics (within 5 days of any clinic visit).
- Currently participating in or has participated in any other study involving an investigational product in the last 4 weeks.

Study design
Purpose of the study
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Participants will be stratified to the intervention or control group based on their age, gender, and smoking (current user of tobacco or non-user of tobacco (no tobacco use for 6 months or more).
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
A random number generator was used to perform permuted block randomization.

Randomization codes will be kept in a sealed envelope in a secure filing cabinet. While the study is a double blind trial, study investigators will know the location of, and have access to, the sealed randomisation code envelope. This is in the event of an emergency where the content of the treatment is needed to be known. In the event that the code break envelope is opened, the ethics committee and the Sponsor will be informed. Each participants unblinding is considered on a case-by-case basis following authorisation by the Safety Committee which includes the Research Nurse, Chairman of the Safety Committee (General Practitioner [GP]) and the Principal Investigator.
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?
The people receiving the treatment/s
The people administering the treatment/s
The people assessing the outcomes
The people analysing the results/data
Intervention assignment
Other design features
Randomised, double-blind, placebo-controlled, parallel intervention trial.
Phase 3 / Phase 4
Type of endpoint(s)
Statistical methods / analysis

Recruitment status
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)

Funding & Sponsors
Funding source category [1] 290628 0
Commercial sector/Industry
Name [1] 290628 0
Address [1] 290628 0
600 E. Court Avenue
Suite A
Des Moines, IA 50309
Country [1] 290628 0
United States of America
Primary sponsor type
Centre for Human Psychopharmacology, Swinburne University.
Mail H24
PO Box 218
Hawthorn, Victoria, 3122
Secondary sponsor category [1] 289320 0
Name [1] 289320 0
Address [1] 289320 0
Country [1] 289320 0

Ethics approval
Ethics application status
Ethics committee name [1] 292262 0
Bellberry Limited
Ethics committee address [1] 292262 0
129 Glen Osmond Road
South Australia 5063
Ethics committee country [1] 292262 0
Date submitted for ethics approval [1] 292262 0
Approval date [1] 292262 0
Ethics approval number [1] 292262 0

Brief summary
This research project is aiming to determine the effects of 3 months supplementation with a proprietary spearmint extract, on cognitive functioning in healthy individuals.

Participants will be required to complete 4 testing sessions and 1 screening session. During these sessions they will be asked to complete a variety of measures assessing cognitive function and general health.

Participants will be asked to take one of the following treatments for a 90 day period:

- Proprietary spearmint extract
- Matched placebo

Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 54354 0
Prof Andrew Scholey
Address 54354 0
Centre for Human Psychopharmacology
Mail H24
PO Box 218
Hawthorn, Victoria, 3122
Country 54354 0
Phone 54354 0
Fax 54354 0
Email 54354 0
Contact person for public queries
Name 54355 0
Prof Andrew Scholey
Address 54355 0
Centre for Human Psychopharmacology
Mail H24
PO Box 218
Hawthorn, Victoria, 3122
Country 54355 0
Phone 54355 0
Fax 54355 0
Email 54355 0
Contact person for scientific queries
Name 54356 0
Prof Andrew Scholey
Address 54356 0
Centre for Human Psychopharmacology
Mail H24
PO Box 218
Hawthorn, Victoria, 3122
Country 54356 0
Phone 54356 0
Fax 54356 0
Email 54356 0

No information has been provided regarding IPD availability
Summary results
Have study results been published in a peer-reviewed journal?
Other publications
Have study results been made publicly available in another format?
Results – basic reporting
Results – plain English summary