Caffeine is the most widely consumed psychoactive substance on Earth — and it earned that status. Our research, from 46 RCTs, 11 meta-analyses, and 13,000+ participants, confirms it reliably improves alertness, exercise performance, and aspects of cognitive function. At moderate doses (200-400mg/day), it's safe for most adults. The key is dosing: too little and you get nothing, too much and you get anxiety, insomnia, and cardiovascular side effects. Satia Morning contains 150mg — right in the sweet spot for cognitive benefits with minimal side effects.
Increases drug levels
Keep caffeine intake consistent. Never suddenly increase or decrease.
Additive stimulant effects
Avoid combination.
Faster disease progression
Parkinson's patients: avoid combination. Athletes: use acutely, not chronically together.
Alters drug levels
Monitor for increased drug effects.
Increases caffeine levels
Reduce caffeine intake when on CYP1A2 inhibitors.
Alters lithium levels
Keep caffeine intake consistent. Don't suddenly stop.
Additive stimulation
Use caution with combined stimulants.
Reduces drug absorption
Take levothyroxine 1+ hour before or after caffeine.
May reduce drug effectiveness
Moderate caffeine use with epilepsy.
Alters effectiveness
Keep caffeine intake consistent.
Reduces zinc absorption
Don't take zinc supplements with coffee.
Increases melatonin levels
Avoid caffeine close to bedtime regardless.
Possible MAO inhibition
Use caution with MAOIs.
Caffeine supplements may contain more or less caffeine than labeled. Some have been adulterated with banned or unsafe substances.
Monitored substance. Not prohibited, but monitored in competition. Urinary caffeine above 12 μg/mL was previously a doping violation; current policy only monitors usage patterns.
Caffeine supplements may contain more or less caffeine than labeled. Some have been adulterated with banned or unsafe substances.
ISSN confirms caffeine (3-6mg/kg) consistently improves exercise performance across multiple modalities.
Guest NS et al. International society of sports nutrition position stand: caffeine and exercise performance.. J Int Soc Sports Nutr (2021). PMID: 31722088
400mg/day for adults and 200-300mg/day for pregnant women does not raise safety concerns.
Wikoff D et al. Systematic review of the potential adverse effects of caffeine consumption in healthy adults, pregnant women, adolescents, and children.. Food Chem Toxicol (2017). PMID: 33561864
Caffeine improves vigilance, reaction time, and cognitive function, with effects dependent on dose and tolerance.
McLellan TM et al. A review of caffeine's effects on cognitive, physical and occupational performance.. Neurosci Biobehav Rev (2016). PMID: 29609501
Moderate caffeine use enhances both cognitive and physical performance; withdrawal symptoms indicate physical dependence.
Cappelletti S et al. Caffeine: Cognitive and Physical Performance Enhancer or Psychoactive Drug?. Curr Neuropharmacol (2015). PMID: 33531707
Moderate caffeine consumption (3-5 cups coffee/day) is not associated with increased cardiovascular risk and may be protective.
Gonzalez de Mejia E et al. Caffeine and the Risk of Cardiovascular Disease.. Compr Rev Food Sci Food Saf (2019). PMID: 33041752
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated: April 5, 2026
Not medical advice. Based on published clinical research and systematic reviews.