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Completed

NCT Number: NCT06117280

Effect of Different Dosages of Paraxanthine, the Major Caffeine Metabolite, on Energy and Focus

Research has shown that acute ingestion of Paraxanthine (1,7-dimethylxanthine, PXN) can enhance various markers of focus, including memory, reaction time, and attention in healthy adults. To assess these effects, this placebo-controlled crossover trial will compare the effects of 200 and 300mg of PXN to a placebo control. Participants will abstain from caffeine for 3 days, before taking the first test/placebo product for 3 consecutive days. Participants will complete questionnaires at 30, 60, 90, and 120 minutes after ingestion on Day 1 and Day 3 of ingestion. Participants will have a 3-day washout period before trialing the next test product/placebo.

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Key information

Conditions

Energy Caffeine Withdrawal Focus

Age range

18 year–35 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Citruslabs

Santa Monica, California, 90404, United States

About this study

Following enrollment to the study, participants will abstain from any products containing caffeine, for 3 days.

On the night of the 3rd day of caffeine abstinence, participants will fast overnight (~10 hours) The morning after the fast, participants will complete the Day 1 baseline questionnaire.

Participants will then consume Test Product A and complete questionnaires 30, 60, 90, and 120 minutes after ingestion. Test Products should be consumed in a fasted state, and 1-hour post-ingestion participants will consume a standardized meal (See Section 6.3).

On Day 2, participants will consume Test Product A again but will not complete any questionnaires. The product should be consumed in a fasted state and participants will consume the standardized meal 60 minutes post-ingestion.

On Day 3, participants will consume Test Product A in a fasted state and will again consume the standardized meal 1-hour following ingestion of the product. Participants will complete questionnaires 30, 60, 90, and 120 minutes after ingestion. Participants will then have a 3-day washout period with no products consumed or questionnaires completed.

Following the washout period, the intervention cycle will be repeated with Test Product B and, subsequently, Test Product C.

The questionnaires will consist of study-specific surveys and a cognitive assessment battery.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Aged between 18-35
  • Willing to abstain from caffeine-containing beverages and foods during the duration of the study
  • Recreationally active; currently performing structured exercise (e.g., running, weightlifting, team-sport activity) at least 2 days per week for the previous 3 months

Exclusion criteria

  • Body Mass Index: >29.9kg/m2
  • Inability to adhere to protocol guidelines (e.g., caffeine, alcohol, tobacco)
  • Regular tobacco use
  • Illicit drug use (e.g., growth hormone, testosterone, etc.)
  • A diagnosed medical condition under the care of a physician (e.g. type 2 diabetes) Inability to abstain from supplements (e.g. protein, creatine, HMB, BCAA, phosphatidic acid, etc.) at least three weeks before the trial
  • Individuals on medications known to affect caffeine metabolism (e.g., corticosteroids, non-steroidal anti-inflammatories, or prescription-strength acne medications)
  • Participants who are amenorrheic (females only)
  • Inability to comply with the study protocol as judged by the investigators

Treatment and study plan

Paraxanthine 200 mg

Other

For the three-day test cycle, participants will take one capsule per day amounting to 200mg of paraxanthine.

Paraxanthine 300 mg

Other

For the three-day test cycle, participants will take one capsule per day amounting to 300mg of paraxanthine.

Placebo

Other

The placebo will contain resistant dextrin. For the three-day test cycle, participants will take one capsule per day amounting to 300mg of resistant dextrin.

Primary outcomes

  1. Changes in scores on a cognitive assessment "Double Trouble". [Time Frame: Baseline to Day 3 of each test cycle]

    Time frame: 18 days

    Participants will independently complete a cognitive assessment battery at home on their computer or tablet. "Double Trouble" is a 90-second timed test. Based on a classic Stroop test, Double Trouble measures selective attention, processing speed, and the brain's ability to focus on specific information when presented with conflicting and layered stimuli.

  2. Changes in scores on a cognitive assessment "Feature Match". [Time Frame: Baseline to Day 3 of each test cycle]

    Time frame: 18 days

    Participants will independently complete a cognitive assessment battery at home on their computer or tablet. "Feature Match" is a 90-second timed test. Feature Match is a focus and processing task that requires surveying an increasingly difficult array of information and rapidly assessing the correct response while holding previously processed and detailed information in attention.

  3. Changes in scores on a cognitive assessment "Grammatical Reasoning". [Time Frame: Baseline to Day 3 of each test cycle]

    Time frame: 18 days

    Participants will independently complete a cognitive assessment battery at home on their computer or tablet. "Grammatical Reasoning" is a 90-second timed test. Grammatical Reasoning is a deductive reasoning task that requires quickly interpreting phrases and making logical conclusions from understanding. Variation between text and shapes on screen requires holding key information in short-term memory to properly complete the task, leveraging the same parts of the brain that enable an individual to remain focused between varied stimuli.

  4. Changes in scores on a cognitive assessment "Digit Span". [Time Frame: Baseline to Day 3 of each test cycle]

    Time frame: 18 days

    Participants will independently complete a cognitive assessment battery at home on their computer or tablet. "Digit Span is a 3-4 minute performance based test. Increasing in length after each successful attempt, Digit Span requires users to focus on displayed numbers, hold them in short-term memory, and repeat them back correctly, thereby showing cognitive flexibility and the brain's ability to perform memory and attention-related tasks without error.

Secondary outcomes

  1. Occurence of the side effects of caffeine withdrawal. [Baseline to Endline]

    Time frame: 18 days

    Decrease in symptoms of caffeine withdrawal including jitters, fatigue, drowsiness, irritability, "brain fog", and low alertness. This will be reported via participant-reported questionnaires. Incidence and severity of side effects will be reported using a Likert scale (0-5 point scale) with 0=least severe and 5=most severe.

Sponsors and collaborators

Lead sponsor

Iovate Health Sciences International Inc

Industry

Collaborators

  • Citruslabs

Registry information

Official study title

Effect of Different Dosages of Paraxanthine, the Major Caffeine Metabolite, on Energy and Focus: A Randomized, Double-Blind, Placebo-Controlled, Crossover Trial

Important dates

Study start
2023
Primary completion
2023
Study completion
2023
First posted
Nov 7, 2023
Registry last updated
Nov 7, 2023

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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