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Paraxanthine Side Effects & Safety

Evidence:Emerging
·

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Generally well-tolerated at recommended doses
  • Mild insomnia if taken too late in the day
  • Occasional headache during initial use
  • Less likely than caffeine to cause anxiety, jitters, or heart palpitations

Drug & Supplement Interactions

  • May have additive effects with caffeine and other stimulants — reduce caffeine intake when adding paraxanthine
  • CYP1A2 metabolism — individuals who are slow caffeine metabolizers may also metabolize paraxanthine more slowly
  • Avoid combining with high-dose ephedrine or other sympathomimetics

Maximum Dose

Do not exceed: 300mg/day (higher doses have not been adequately studied)

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References

  1. RCTYoo C, Xing D, Gonzalez D, et al. (2023). Acute paraxanthine ingestion improves cognition and short-term memory and helps sustain attention in a double-blind, placebo-controlled, crossover trial. Nutrients. DOI PubMed
  2. RCTXing D, Yoo C, Gonzalez D, et al. (2021). Dose-response of paraxanthine on cognitive function: a double-blind, placebo-controlled, crossover trial. Nutrients. DOI PubMed
  3. Arnaud MJ (2011). Pharmacokinetics and metabolism of natural methylxanthines in animal and man. Handbook of Experimental Pharmacology. DOI PubMed
  4. RCTBingol Diedhiou A, Yildirim UC, Ozdenk S, Erkan D, et al. (2026). Comparative effects of caffeine and paraxanthine on rowing performance and sleep quality: a randomized crossover study.. Journal of the International Society of Sports Nutrition. DOI PubMed
  5. Główka N, Malik J, Anioła J, Zawieja EE, et al. (2024). The effect of caffeine dose on caffeine and paraxanthine changes in serum and saliva and CYP1A2 enzyme activity in athletes: a randomized placebo-controlled crossover trial.. Nutrition & metabolism. DOI PubMed
  6. RCTYoo C, Xing D, Gonzalez DE, Jenkins V, et al. (2024). Paraxanthine provides greater improvement in cognitive function than caffeine after performing a 10-km run.. Journal of the International Society of Sports Nutrition. DOI PubMed
  7. RCTGross KN, Allen LE, Hagele AM, Krieger JM, et al. (2024). A Dose-Response Study to Examine Paraxanthine's Impact on Energy Expenditure, Hunger, Appetite, and Lipolysis.. Journal of dietary supplements. DOI PubMed
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  2. Ali A, O'Donnell JM, Starck C, Rutherfurd-Markwick KJ (2015). The Effect of Caffeine Ingestion during Evening Exercise on Subsequent Sleep Quality in Females.. International journal of sports medicine. DOI PubMed
  3. Zadoyan G, Rokitta D, Klement S, Dienel A, et al. (2012). Effect of Ginkgo biloba special extract EGb 761® on human cytochrome P450 activity: a cocktail interaction study in healthy volunteers.. European journal of clinical pharmacology. DOI PubMed
  4. Gurley BJ, Gardner SF, Hubbard MA, Williams DK, et al. (2005). Clinical assessment of effects of botanical supplementation on cytochrome P450 phenotypes in the elderly: St John's wort, garlic oil, Panax ginseng and Ginkgo biloba.. Drugs & aging. DOI PubMed
  5. Gurley BJ, Gardner SF, Hubbard MA, Williams DK, et al. (2005). In vivo effects of goldenseal, kava kava, black cohosh, and valerian on human cytochrome P450 1A2, 2D6, 2E1, and 3A4/5 phenotypes.. Clinical pharmacology and therapeutics. DOI PubMed