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Best Caffeine Pills and SupplementsCaffeine supplements will increase blood flow from the heart to all parts of the body, which is beneficial to the weight trainer and those muscles which need all the nutrient-rich blood they can receive during an intense workout session. The surge of adrenaline that caffeine instigates also produces the release of extra glucose and oxygen into muscles which allows the trainer to push himself as far as he can go without suffering from premature muscle collapse and fatigue. In addition, research has indicated that caffeine may delay the beginning of muscle fatigue by promoting the utilization of fat reserves by the body instead of glycogen for energy. This is a process called “glycogen sparing”, which basically describes how keeping glycogen levels from depleting can prevent muscle breakdown. Another benefit caffeine is thought to have for athletes is its ability to release endorphins, which help lessen feelings of pain.