Add Yahoo as a preferred source to see more of our stories on Google. "Pre-workout supplements can be effective depending upon the ingredients, dose and timing," says Marie Spano, a sports performance ...

Most pre-workout supplements are considered safe for many adults, but they are not essential for health or exercise performance. Their ingredient mixes vary widely by brand. Ingredients like caffeine, ...

Pre-workout supplements are intended to boost energy so you can work out harder and longer. Taking pre-workout can cause side effects like nausea and shakiness due to high caffeine content. While ...

Pre-workout supplements are designed to provide energy to fuel workouts and improve athletic performance. They are generally intended to be taken 30-60 minutes before exercise to get the most out of ...

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A SAVVY CONSUMER like you knows that supplements are a largely unregulated industry, with supplement companies advertising all kinds of supposed benefits for their pills, powders, and potions.