https://en.wikipedia.org/wiki/Caffeine
Caffeine (data page) Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. [9] It is mainly used as a eugeroic ( wakefulness promoter) or as a mild cognitive enhancer to increase alertness and attentional performance. [10] [11] Caffeine acts by blocking binding of adenosine to the adenosine A 1 receptor, which

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/caffeine/art-20045678
Learn about the benefits and risks of caffeine, how much is safe for different groups and how to cut back if you need to. Find out how caffeine interacts with medications, supplements and sleep.

https://www.healthline.com/nutrition/what-is-caffeine
Caffeine is a natural stimulant that can improve mood, brain function, metabolism, and exercise performance. Learn about its sources, dosages, side effects, and how it affects your health.

https://www.webmd.com/vitamins/ai/ingredientmono-979/caffeine
Learn about caffeine, a natural chemical with stimulant effects found in coffee, tea, cola, and other products. Find out how caffeine can help with headache, migraine, mental alertness, and more, and what are the risks and precautions.

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/caffeine/art-20049372
Learn how much caffeine is in your favorite beverages and how it affects your health. See charts of caffeine levels for different drink sizes and types, and get tips on how to limit your intake.

https://www.medicalnewstoday.com/articles/285194
Caffeine is a stimulant that occurs naturally in some foods and drinks. Learn about its uses, sources, benefits, risks, myths, and overdose potential.

https://www.verywellhealth.com/what-is-caffeine-and-is-it-good-for-you-5216616
Caffeine is a stimulant that occurs naturally in many plants and is widely used in foods, drinks, and medications. Learn about its effects on the brain, body, and health, as well as its potential risks and interactions.

https://www.healthline.com/health/caffeine-effects-on-body
Caffeine is a stimulant that can boost your energy, alertness, and mood. Learn how caffeine affects your central nervous system, digestive system, circulatory system, and more, and what are the safe and unsafe levels of consumption.

https://nutritionsource.hsph.harvard.edu/caffeine/
Guarana. This is a seed from a South American plant that is processed as an extract in foods, energy drinks, and energy supplements. Guarana seeds contain about four times the amount of caffeine as that found in coffee beans. [4] Some drinks containing extracts of these seeds can contain up to 125 mg caffeine per serving.

https://medlineplus.gov/caffeine.html
Caffeine is a bitter substance that occurs naturally in more than 60 plants and is added to some medicines, foods, and drinks. Learn about caffeine's effects, side effects, withdrawal, and who should avoid or limit it.

https://www.healthline.com/nutrition/caffeine-side-effects
Caffeine is a stimulant that can boost your mood, metabolism and performance, but too much of it can cause anxiety, insomnia, digestive issues, muscle breakdown and more. Learn how caffeine affects your body, how much is safe for you and how to adjust your intake accordingly.

https://zhornsoftware.co.uk/caffeine/
Caffeine is a free app that simulates a keypress every 59 seconds to keep your PC awake. It has a coffee pot icon in the task tray and can be enabled or disabled with a double-click.

https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much
For reference, a 12 ounce can of a caffeinated soft drink typically contains 30 to 40 milligrams of caffeine, an 8-ounce cup of green or black tea 30-50 milligrams, and an 8-ounce cup of coffee

https://www.everydayhealth.com/diet-nutrition/diet/caffeine-health-benefits-risks-sources/
Though the chatter is always on coffee, caffeine is found in many other sources, including: Tea While most herbal teas (like chamomile) are caffeine-free, others contain varying amounts.() For

https://www.webmd.com/diet/how-caffeine-affects-your-body
Caffeine is a stimulant that can boost your alertness, mood, and memory, but also cause side effects like jitteriness, insomnia, and heartburn. Learn how caffeine affects your nervous system, heart, digestion, urination, and pregnancy, and what are the safe and unsafe levels of consumption.

https://www.medicalnewstoday.com/articles/271707
Caffeine is a natural stimulant that occurs in coffee, tea, and other foods and drinks. Learn about its benefits, adverse effects, variation, addiction, and risks for young people.

https://www.ncbi.nlm.nih.gov/books/NBK519490/
Caffeine is a naturally occurring central nervous system stimulant belonging to the methylxanthine class and is widely recognized as the most utilized psychoactive stimulant worldwide. Although this drug is most commonly sourced from coffee beans, it can also naturally occur in certain types of tea and cacao beans and as an additive to soda and energy drinks.

https://health.clevelandclinic.org/know-whats-in-your-coffee
For adults, consuming as little as 300 milligrams of caffeine (that's roughly four cups of coffee) in a day can increase your risk of nausea, anxiety, sleeplessness, restlessness and other side

https://www.drugs.com/caffeine.html
Caffeine is a stimulant found in foods, beverages and medications. Learn about its uses, dosage, warnings, side effects, overdose and drug interactions.

https://pubchem.ncbi.nlm.nih.gov/compound/caffeine
Caffeine is a drug of the methylxanthine class used for a variety of purposes, including certain respiratory conditions of the premature newborn, pain relief, and to combat drowsiness. Caffeine is similar in chemical structure to [Theophylline] and [Theobromine]. It can be sourced from coffee beans, but also occurs naturally in various teas and

https://www.healthline.com/nutrition/natural-caffeine
Learn the difference between natural and synthetic caffeine, and what foods and drinks contain natural caffeine. Find out how natural caffeine affects your body and why it may be better for your health.

https://www.caffeine.tv/
Caffeine is a live streaming platform for sports fans and creators. Watch live games, tournaments, highlights, and podcasts from various sports, such as football, poker, baseball, and more.

https://www.healthline.com/nutrition/top-evidence-based-health-benefits-of-coffee
This article takes an in-depth look at 9 of the top evidence-based benefits of coffee. 1. Boosts energy levels. Coffee contains caffeine, a central nervous system stimulant that is known for its