Except pre-workout supplements can be, well, kind of misleading. First off, like all dietary supplements, the FDA doesn’t approve them before they go to market.

Warning Signs of Too Much Caffeine Caused by Pre-Workout If you cannot live without your daily cup of coffee and are still looking to take a pre-workout, you should be cautious.

SHOPPING: Tammy Hembrow's supplement brand Selfish Supps is now available to shop in the UK (and we have an exclusive discount code for your first order).

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Pre-workout powders and pills are meant to be used before exercising to boost your energy and performance. They often contain caffeine, creatine, glucose, and amino acids. The result: a highly ...

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