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Compared to something like an energy drink or coffee, the crash from infinergii should be very small. But if you are used to the smooth experience of Thriiv, then in comparison, Infinergii will be a little more tiresome around the 6 hour mark. A lot of the user reports experience lethargy after using Infinergii, but mostly because they were performing at an extremely high level for the previous 5 hours. Exerting an intense amount of energy for such a time period would make anyone exhausted.