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ANHYDROUS CAFFEINE的用量、作用機轉、副作用、懷孕及哺乳用藥與藥物交互作用，ANHYDROUS CAFFEINE適應症:提神、緩解偏頭痛、緩解感冒之各種症狀。 登入/註冊
咖啡因（英文 caffeine）存在於世界上60多種植物中，常見的包括可可豆、咖啡豆、茶葉等。. 咖啡因也被研究出對身體會產生某些正面效益，咖啡因對身體主要有4種功效：. 提神醒腦： 咖啡因會阻隔腦部腺苷的接收器。. 腺苷是身體會分泌的神經傳導物質，白天 ...
2024年10月17日 · 咖啡因（英語： caffeine ）是一種黃嘌呤 生物鹼化合物。 咖啡因主要存在於 咖啡樹 、 茶樹 、 巴拉圭冬青 （瑪黛茶）及 瓜拿納 的果實及葉片裡，而 可可樹 、 可樂果 及 代茶冬青樹 也存在少量的咖啡因。
什麼是咖啡因? 咖啡因是廣受歡迎的天然的興奮劑. 咖啡因是存在於植物中天然的驅蟲劑，包含葉子、果實或種子之中藉此對抗蟲害。 但是對於人類來說，這可是天然的興奮劑，咖啡因可以刺激中樞神經系統，包括大腦，透過咖啡因的刺激下，除了提神，也可以減緩痛感和增加肌肉耐受力。 咖啡因是如何作用? 藉由抑制減緩神經活動的傳遞物質以達到提神作用. 咖啡因會進入血流傳送到腦部，主要通過抑制腺苷接受器來發揮作用。 腺苷－Adenosine 是一種神經傳遞物質，可以減緩神經系統的活動，並調節睡眠和警覺狀態。 當咖啡因進入體內後，從而阻斷腺苷的作用。 這導致神經系統的活動增強，提高警覺性、注意力和反應速度，並且可以延長清醒時間。
- Overview
- The lowdown on caffeine
- Is caffeine safe?
- Symptoms of caffeine intoxication
- Benefits of caffeine
- Caffeine’s downside
- Who should avoid or limit caffeine?
- Caffeine withdrawal symptoms
Overview
For many people, a morning without caffeine means a sluggish start to the day. Caffeine is a nervous system stimulant that clears drowsiness and gives you an energy boost.
Caffeine is such an effective stimulant that many people are using a highly concentrated caffeine powder, or caffeine anhydrous, to stimulate athletic performance or weight loss. According to the U.S. Food and Drug Administration (FDA), a teaspoon of caffeine powder is the equivalent of 28 cups of coffee.
This brings up questions about caffeine’s effects on your health. Is all this caffeine beneficial? How much caffeine is too much of a good thing?
Caffeine is a natural substance found in the seeds and leaves of certain plants. The caffeine in coffee comes primarily from Coffea arabica, a shrub or tree that grows in high-altitude subtropical and equatorial regions of the world.
Caffeine anhydrous is made from the seeds and leaves of coffee plants. The word “anhydrous” means “without water.” After harvesting, caffeine is extracted from the plant matter and dehydrated. This produces a highly concentrated caffeine powder.
When you ingest caffeine, it hitches a ride to your brain via your bloodstream. There, it mimics adenosine, a compound that’s present throughout your body.
Adenosine works like a depressant, slowing you down and making you sleepy. Caffeine mimics adenosine so effectively that it’s able to take the place of adenosine in your brain and liven things up.
The stimulant properties of caffeine are increased further because it enhances the effects of natural stimulants, including:
•dopamine
The FDA advises people to avoid highly concentrated caffeine, citing the deaths of at least two young men who used the products. Spurred by the growing incidence of caffeine intoxication due to use of caffeine anhydrous, the FDA issued warning letters to five manufacturers of powdered caffeine in September 2015.
The letters state that caffeine powder “presents a significant or unreasonable risk of illness or injury.” The FDA further stated that the recommended doses on the caffeine powder labels are impossible to portion out accurately using common household measuring tools.
An overdose of caffeine can be fatal. Symptoms of caffeine intoxication can include:
•racing or erratic heartbeat
•vomiting
•diarrhea
•seizures
•abdominal pain
Caffeine does have beneficial properties:
•It reduces fatigue and improves concentration.
•It improves athletic performance, particularly when engaging in endurance sports.
•It’s effective in relieving tension headaches, especially in combination with ibuprofen (Advil).
•It contains antioxidants that prevent or slow cell damage and may offer protection from heart disease and diabetes.
•Coffee drinkers have fewer gallstones.
Caffeine does have some downsides:
•It’s been associated with an increased risk of sudden cardiac death because it can cause an erratic heartbeat.
•Caffeine is a diuretic, meaning it causes you to urinate more frequently. This can lead to dehydration, especially if you’re not drinking enough water or if you’re exercising vigorously.
•Over time, caffeine causes your body to lose calcium, which can lead to loss of bone density and osteoporosis.
•It increases anxiety, nervousness, and insomnia.
•Chemicals in coffee increase cholesterol levels. (Using a paper filter when making coffee will reduce this risk significantly.)
Pregnant women
If you’re pregnant, you should limit your caffeine intake to 200 mg a day, according to the American College of Obstetricians and Gynecologists.
Women who are breastfeeding
Research about the effects of caffeine on the infants of nursing mothers isn’t conclusive. The American Academy of Pediatrics (AAP) advises breastfeeding mothers to drink caffeinated beverages in moderation. The organization recommends that nursing mothers drink no more than three cups of coffee or five caffeinated beverages a day. Only about 1 percent of the caffeine you consume is found in your breast milk, according to AAP. However, infants don’t metabolize caffeine well, and it can stay in their bloodstream longer. The result may be a restless, irritable baby.
Children
The FDA hasn’t issued guidelines for caffeine consumption by children. Canadian guidelines recommend no more than one 12-ounce caffeinated beverage per day for children between the ages of 4 and 6. In a study published in the journal Pediatrics, AAP recommends that children and adolescents not consume more than 100 mg of caffeine per day. To get an idea of what this means, a 12-ounce cola contains between 23 mg and 37 mg of caffeine.
If you’re a java junky looking to cut back on caffeine, withdrawal symptoms may begin within a day of your last cup of joe. Usual signs of withdrawal include:
•headache
•sleepiness
•irritability
2021年10月12日 · According to the FDA, most adults can safely consume up to 400 milligrams of caffeine. The European Food Safety Authority also supports this level of consumption, stating that single doses of 200 milligrams at one time and habitual consumption of 400 milligrams per day are considered safe for non-pregnant women.
2023年7月19日 · Caffeine anhydrous is a dehydrated form of caffeine that is often an ingredient in sports drinks and energy bars. It is a lot more concentrated than caffeine, which means that people need...
