There is a significant difference between the ingredients of RP Max pre-workout and PSI pre-workout as they both have a different purpose and contribute in a different way to enhancing your performance.
RP Max - Take 1 scoop of RP Max with 8-10 oz (240-295 mL) water 15-20 minutes before your workout. To get the most benefit out of RP Max, we recommend that you only use it on training days and not within 5 hours of going to sleep due to its stimulant-based nature. This makes RP Max an optimal addition to morning and lunchtime workouts.
PSI - Take 1 scoop of PSI with 8-10 oz (240-295 mL) water 20 minutes before your workout. As PSI is not stimulant based, it should be used in the place of RPM if training later in the day or at night (less than 5 hours before going to sleep).
Stacking - PSI can be stacked with RP Max so that you gain all the benefits of the stimulants and fat burner thermogenics from RPM along with the increased blood flow benefits from PSI’s vasodilation nutrient delivery system, contributing to a highly energetic, focussed workout along with an increase in muscle volumization and pump. This combination should only be used in the morning or for lunchtime workouts due to its stimulant-based nature.