Caffeine is a substance found naturally in many plants. It’s also abundant in coffee, tea, soda, and chocolate, and is taken in powders, pills, or an ingredient in energy supplements. Adenosine slows down nerve cell activity and causes drowsiness. Caffeine binds to the same receptors as adenosine, blocking its effects. This causes increased neuron firing. The pituitary gland registers this activity as an emergency. This releases hormones causing increased breathing, heart rate, blood flow to muscles, and blood pressure. It also decreases blood flow to the stomach and releases sugar into the blood for extra energy. Read More
- Simple Report
- Detailed Report
- Overall Effectiveness Rating
- Research Rating
- Products Containing Caffeine
- Claim Ratings
Overall Effectiveness Rating
The overall effectiveness rating for caffeine is 2 out of 3. This rating means the evidence is mixed on the supplement's ability to deliver positive results. While some of the research supports its use, other evidence does not. Using this supplement may lead to positive results. Note, this effectiveness rating is for caffeine as a whole; there are also individual ratings for the claims below.
Read more: What is the effectiveness rating?
Research Rating for Caffeine
There are 60 studies in the database on caffeine; the research rating is 140. A score above 80 means the effectiveness rating for this supplement is reliable. A score under 80 means there is insufficient evidence to ensure a reliable effectiveness rating. Note, this research rating is for caffeine as a whole; there are also individual ratings for the claims below.
Read more: What is the research rating?
Products Containing Caffeine
|Products Names||Amount of Caffeine|
|Full list of all 382 products containing Caffeine.|
The overall ratings above are an average of the individual claim ratings below. Individual claims may have higher or lower ratings compared to the supplement's overall rating. For example, some supplements may have excellent backing for one claim, but be completely useless for another. Click on a claim below for more information.
|Performance Claims||Effectiveness Rating||Research Rating|
|improve agility||improve cardiovascular endurance||improve cycling performance||improve muscular endurance||improve running performance||improve sports performance||improve sprint performance||decrease fatigue||increase strength||improve cycling sprint performance||increase alertness|
|Mental Health Claims||Effectiveness Rating||Research Rating|
|improve cognitive ability||improve memory||improve mood|
|General Health Claims||Effectiveness Rating||Research Rating|
|improve insulin sensitivity|