Review Details

4EverFit Caffeine (200 mg) - 100 Tablets

Product Review (submitted on February 21, 2011):

As a psychoactive substance, caffeine has a variety of effects. This includes is being a CNS stimulant. There are a variety of effects of using caffeine and thus a variety of reasons to use it including benefiting athletes.

Caffeine and Exercise Performance: Caffeine is well-documented as improving endurance exercise. This is due to its ability to significantly delay fatigue, which improves exercise length by up to 50%. Caffeine is more effective among those that do not use it often. It seems most effective for short-term high-intensity exercise such as strength training. When used with carnitine and ephedrine it can further improve endurance exercise length.

Mechanism of action: Caffeine’s ability to improve performance is related to the various ways caffeine can increase neuromuscular function. This includes it changing the muscle environment’s chemical composition.. In addition, it might delay the feeling of fatigue by helping keep skeletal muscle from losing potassium. Caffeine is also an analgesic that allows the user to tolerate more pain by promoting release of beta-endorphins and other hormones that affect the feeling of pain.

Caffeine and Weight Loss: Caffeine possesses fat burning capabilities. However, it usually only provides major weight loss when used in very high doses, but smaller doses are effective combined with other powerful weight loss ingredients, especially green tea.

Fatigue, Cognitive Performance, and Sleep: In dosages from 150-400mg caffeine can improve cognitive function. This includes improving performance and speed of intellectual tasks. However, it can impair fine motor coordination. Caffeine does help deal with fatigue and the effects of lack of sleep.

Withdrawal Effects: Since caffeine is addictive, there are various withdrawal effects when consistent users stop using it. This includes headaches, irritability, sleepiness, dysphoria, nausea, nervousness, restlessness, anxiety, and muscle tension.

Other Side Effects and Precautions: Many think caffeine affects hydration status, but studies have found it minimally affects fluid retention and is about equivalent to water. Caffeine can raise blood pressure, so it is best avoided by people with high blood pressure or high risk of cardiovascular disease. Doses over 300mg can cause or increase feelings of anxiety/stress. Caffeine tolerance and addiction effects usually wear off after a day of abstaining from caffeine, however caffeine use can increase the lasting addictive effect of other drugs. Caffeine can reduce bone mineral density. Some drugs negatively interact with caffeine. Also, caffeine can increase the kidney and liver toxicity of acetaminophen and alcohol.