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If we talk about this workout, Stim Free Pre-Workout will not contain caffeine which has been used widely in supplements. In supplements this is used to increase alertness and endurance.
About a non-stim free workout, it is a similar supplement but it does not contain caffeine or stimulant.
According to some people, they found stimulants to increase jitteriness and negatively impact their hormones and sleep.
If we talk about the effects of this kind of Pre-Workout, then the effects of this workout kick in within 30 minutes and typically last for several hours. But if we talk about perceived effects then these are less pronounced than those produced by stim based Pre-Workout supplement.
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