"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." You may wonder if trying a pre-workout supplement, which is marketed to increase your focus or enhance ...
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Verywell Health on MSN
What does pre-workout do to your body before exercise?
Medically reviewed by Karina Tolentino, RD Key Takeaways Pre-workout supplements often contain caffeine and amino acids to ...
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