Caffeine

Does caffeine work?

What is Caffeine?

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

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Caffeine Claims

The supplement database currently has 15 claims for Caffeine. The claims include: improve sprint performance, decrease fatigue, improve cycling sprint performance, improve cycling performance, improve sports performance, increase strength, improve muscular endurance, improve cardiovascular endurance, improve cognitive ability, improve mood, improve memory, increase alertness, improve running performance, improve insulin sensitivity, improve agility .

Overall Effectiveness Rating for Caffeine

The overall effectiveness rating for caffeine is 2 out of 3. This rating means there is some evidence that using caffeine may lead to positive results. This rating also means that some evidence does not back up all claims. Below you can find individual ratings for specific claims.

Overall Confidence Rating for Caffeine

There are 105 studies in the database on caffeine; the confidence 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 rating is for caffeine as a whole. There are also individual ratings for the claims below.

Products Containing Caffeine

There are 148 products in the database containing Caffeine. Follow the link to see the full list.

Individual Claims

The overall ratings above do no necessarily reflect each claim about caffeine. Individual claims can have higher or lower ratings. For example, some supplements may have a lot of backing for one claim, but be completely useless for another. Click on claims below for more information.

The effectiveness rating for caffeine's ability to decrease fatigue is 1.8 out of 3. The confidence rating for this claim is 240. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to decrease fatigue.

Effectiveness Rating for this claim: 1.8 out of 3

Confidence Rating for this claim: 240

The effectiveness rating for caffeine's ability to improve agility is 1 out of 3. The confidence rating for this claim is 20. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve agility .

Effectiveness Rating for this claim: 1 out of 3

Confidence Rating for this claim: 20

The effectiveness rating for caffeine's ability to improve cardiovascular endurance is 3 out of 3. The confidence rating for this claim is 20. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve cardiovascular endurance.

Effectiveness Rating for this claim: 3 out of 3

Confidence Rating for this claim: 20

The effectiveness rating for caffeine's ability to improve cognitive ability is 2.2 out of 3. The confidence rating for this claim is 340. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve cognitive ability.

Effectiveness Rating for this claim: 2.2 out of 3

Confidence Rating for this claim: 340

The effectiveness rating for caffeine's ability to improve cycling performance is 2 out of 3. The confidence rating for this claim is 120. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve cycling performance.

Effectiveness Rating for this claim: 2 out of 3

Confidence Rating for this claim: 120

The effectiveness rating for caffeine's ability to improve cycling sprint performance is 1.8 out of 3. The confidence rating for this claim is 160. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve cycling sprint performance.

Effectiveness Rating for this claim: 1.8 out of 3

Confidence Rating for this claim: 160

The effectiveness rating for caffeine's ability to improve insulin sensitivity is 1 out of 3. The confidence rating for this claim is 20. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve insulin sensitivity.

Effectiveness Rating for this claim: 1 out of 3

Confidence Rating for this claim: 20

The effectiveness rating for caffeine's ability to improve memory is 2 out of 3. The confidence rating for this claim is 60. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve memory.

Effectiveness Rating for this claim: 2 out of 3

Confidence Rating for this claim: 60

The effectiveness rating for caffeine's ability to improve mood is 2 out of 3. The confidence rating for this claim is 160. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve mood.

Effectiveness Rating for this claim: 2 out of 3

Confidence Rating for this claim: 160

The effectiveness rating for caffeine's ability to improve muscular endurance is 1.6 out of 3. The confidence rating for this claim is 160. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve muscular endurance.

Effectiveness Rating for this claim: 1.6 out of 3

Confidence Rating for this claim: 160

The effectiveness rating for caffeine's ability to improve running performance is 3 out of 3. The confidence rating for this claim is 40. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve running performance.

Effectiveness Rating for this claim: 3 out of 3

Confidence Rating for this claim: 40

The effectiveness rating for caffeine's ability to improve sports performance is 2.5 out of 3. The confidence rating for this claim is 200. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve sports performance.

Effectiveness Rating for this claim: 2.5 out of 3

Confidence Rating for this claim: 200

The effectiveness rating for caffeine's ability to improve sprint performance is 2 out of 3. The confidence rating for this claim is 200. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to improve sprint performance.

Effectiveness Rating for this claim: 2 out of 3

Confidence Rating for this claim: 200

The effectiveness rating for caffeine's ability to increase alertness is 3 out of 3. The confidence rating for this claim is 120. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to increase alertness.

Effectiveness Rating for this claim: 3 out of 3

Confidence Rating for this claim: 120

The effectiveness rating for caffeine's ability to increase strength is 1.7 out of 3. The confidence rating for this claim is 240. This means there is not enough evidence in the database on this claim and the effectiveness rating above is not valid. Read more about caffeine's ability to increase strength.

Effectiveness Rating for this claim: 1.7 out of 3

Confidence Rating for this claim: 240