The Pre-Workout Stack provides an increase in energy and strength, better mental focus, more aggression, a better pump, and more productive workouts.

A pre-workout is one of the essential supplements you should have in your arsenal. For those days when you have a huge session, or you’re lacking the energy or motivation, pre-workouts are a goldmine that will help you achieve your goals.

RP Max CNS Thermo pre-workout and PSI are high quality pre-workouts that allow you to work harder by increasing your energy and motivation, reducing fatigue, faster recovery, and also give you a great pump. The combination of ingredients has been scientifically selected to work synergistically to boost energy and performance.

Pre-Workout Stack - Key Features

RP Max is a stimulant based pre-workout that provides optimal central nervous system and adrenal gland stimulation to trigger a positive homeostatic energy release, improved cognitive ability, muscular and cardiovascular endurance.


PSI is a non-stimulatory pre-workout that works to promote vasodilation, enhance nutrient and oxygen delivery to working muscle and improve muscle cell hydration and volumization. Vasodilation is where your blood vessels expand, or dilate to allow more blood flow; as blood carries nutrients and oxygen around your body, you get an increase in nutrient and oxygen delivery along with blood flow to working muscles. You should find you can perform better while also exercising harder and longer after using PSI or RPM.

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How to Use RP Max & PSI

RP Max pre-workout and PSI pre-workout both have a different purpose and contribute in a unique 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 RP Max if training later in the day or at night (less than 5 hours before going to sleep).



PSI can be stacked with RP Max so that you gain all the benefits of the stimulants and fat burner thermogenics from RP Max 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.

Supplement Facts

RP Max Ingredient Profile


PSI Ingredient Profile


Will I Crash After Using RP Max or PSI?

RP Max Pre-workout should not cause any post workout crash as it focuses on stimulating the CNS and reducing the blood brain barrier to improve focus and cognitive ability. There is also a limited amount of caffeine, dosed to ensure that you do not burn out your adrenal glands and release excessive cortisol (stress hormone which causes post workout crashes). PSI pre-workout should not cause any post-workout crash as it works by increasing blood flow around your body and improving mental focus and cognitive ability. It is non-stimulatory so there is very little effect on your adrenal glands and cortisol.


What is the optimal dosage?

The recommended dose is 1 scoop per day. However, for both RP Max and PSI, we recommend you test your tolerance to the pre-workouts and stimulants by starting with ½ a scoop and building up from there as required. We recommend taking no more than 2 scoops of PSI or RP Max pre-workout per day.

Can I stack these products?

PSI works very well with RP Max. RP Max can be combined with PSI, Beyond BCAA’s and Acetyl L-Carnitine but should not be combined with OxyShred. RP Max may be stacked with OxyShred, but never taken at the same time due to high levels of caffeine. Beyond BCAA’s works optimally by taking it either during or post-workout when stacked with PSI or RP Max - this will help to deliver maximal anti-catabolic effects, improve stamina and muscle protein synthesis.

Pre-Workout Stack  

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A pre-workout is one of the essential supplements you should have in your arsenal. Pre-Workout Stack by EHPlabs consists of RP Max and PSI. This combination results in an increase in energy, increased strength, better mental focus, more aggression, a better pump, and more productive workouts.

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67.00 USD

Price as configured: 67.00 USD

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Price as configured: 67.00 USD

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