Description
Fully disclosed high-stim formula
Know what is in every scoop.
GYM HIGH The Stacker is a high-stimulant pre-workout powder for experienced adult users. Every active amount is listed, with 15 disclosed active ingredients in one measured 8 g serving.
Also contains 125 mg of guarana seed extract, standardised to 22% caffeine.
High-stim formula
Built for high-intensity sessions.
The Stacker combines beta-alanine, L-tyrosine, L-phenylalanine and citicoline with a high-caffeine stimulant blend. L-theanine, Himalayan pink salt, BioPerine® and vitamins C, B3 and B6 complete the disclosed active formula.
The Stacker is a stimulant-led pre-workout for intense training sessions. Its fully disclosed formula is centred around high-stim ingredients rather than a traditional pump blend.
Fully disclosed formula
All 15 active ingredients.
The amounts below are provided by one 8 g serving.
| Ingredient | Amount per serving | Ingredient type |
|---|---|---|
| Beta-Alanine | 3,200 mg | Amino acid |
| L-Tyrosine | 2,000 mg | Amino acid |
| L-Phenylalanine | 500 mg | Amino acid |
| Caffeine Anhydrous | 350 mg | Caffeine |
| Himalayan Pink Salt | 300 mg | Mineral salt |
| Citicoline (CDP-Choline) | 250 mg | Choline source |
| Cocoabuterol™ cocoa alkaloids | 200 mg | Cocoa alkaloid extract |
| Guarana Seed Extract, standardised to 22% caffeine | 125 mg | Botanical caffeine source |
| Hordenine HCl | 75 mg | Named formula ingredient |
| L-Theanine Extract | 50 mg | Amino acid |
| GBBGO™ Gamma Butyrobetaine | 50 mg | Named formula ingredient |
| BioPerine® Black Pepper Fruit Extract | 5 mg | Black pepper fruit extract |
| Vitamin C | 250 mg | Vitamin |
| Vitamin B3 — Niacin | 20 mg | Vitamin |
| Vitamin B6 | 6 mg | Vitamin |
Vitamin C, niacin and vitamin B6 contribute to normal energy-yielding metabolism and the reduction of tiredness and fatigue.
What to expect
The Stacker is a very high-caffeine, high-stim pre-workout. Individual response to caffeine and other ingredients varies, so assess the formula, your total caffeine intake and the label warnings before use.
Beta-alanine can produce a temporary tingling sensation in some people. This sensation varies between individuals and is not a measure of product effectiveness.
Real-world testing
Review Bros Tested The Stacker
Review Bros put The Stacker through a real-world training session, covering flavour, value, energy and focus. These highlights reflect their testing experience, not guaranteed results.
Playing this video connects to YouTube’s privacy-enhanced player.
Review Bros received The Stacker free of charge after visiting our Oxford store. The opinions and testing shown in the video are their own.
How to use
Measure one serving carefully.
Mix one scoop (8 g) with 250–300 ml of chilled water. Shake or mix vigorously for approximately 30 seconds and consume around 30 minutes before intense exercise.
The supplied scoop is a measuring guide and may not always provide exactly 8 g. Use weighing scales when an accurate serving is required.
Do not consume more than one full serving in any 24-hour period.
Warnings
High caffeine. Read before use.
One serving contains 350 mg caffeine anhydrous and an additional caffeine source from 125 mg guarana extract standardised to 22% caffeine. This is a very high-caffeine pre-workout intended only for experienced adult users who understand their caffeine tolerance.
Account for caffeine consumed from coffee, tea, energy drinks and other supplements. Do not combine The Stacker with additional caffeinated pre-workout or stimulant products.
For adults only. Not intended for anyone under 18 years of age. Do not use during pregnancy or while breastfeeding. Do not exceed the recommended daily intake.
Consult a medical practitioner before use if you have a medical condition or take prescription medication, including blood-thinning medication. Discontinue use and seek medical advice if an adverse reaction occurs.
Allergen notice: Manufactured in a facility that handles milk, egg, soya, nuts, wheat and gluten.
Food supplements should not be used as a substitute for a varied, balanced diet and healthy lifestyle. Keep out of reach of children. Store in a cool, dry place away from direct sunlight. Do not consume the silica desiccant sachet contained inside the tub.
Flavours and servings
Three flavours. 30 servings.
Each container provides approximately 30 servings.
Flavouring, colouring and other ingredients may vary between flavours. Always check the packaging supplied with your selected flavour.
- Electric Blue
- Sour Green Apple
- Tropical Punch
Frequently asked questions
How much caffeine is in The Stacker?
Each serving contains 350 mg caffeine anhydrous. The formula also includes 125 mg guarana extract standardised to 22% caffeine, so caffeine comes from more than one ingredient.
Is The Stacker a high-stim pre-workout?
Yes. The Stacker is a very high-caffeine pre-workout intended for experienced adult users who understand their caffeine tolerance.
Does The Stacker contain creatine?
No. Creatine is not listed among the 15 disclosed active ingredients.
Is The Stacker designed for pump?
The Stacker is a stimulant-led, high-stim pre-workout rather than a traditional pump formula.
How many servings are in a tub?
Each container provides approximately 30 servings when measured at 8 g per serving.
When should I take it?
Mix one 8 g serving with 250–300 ml of chilled water and consume it approximately 30 minutes before intense exercise. Never exceed one serving in 24 hours.
Is The Stacker suitable for beginners?
The Stacker is a very high-caffeine pre-workout intended for experienced adult users. If you are new to pre-workouts or sensitive to caffeine, The Stacker may not be the right product for you.
GYM HIGH The Stacker
Full formula. Clear dosing.
15 disclosed active ingredients, 30 servings and three flavours. Choose your flavour above and review the high-caffeine warning before adding to your pre-workout routine.
Josh P –
I’ve tried several different brands and they all usually give me the same feeling. This pre workout is still strong enough to get the job done without the huge crash at the end. Dry scoop it💪
William D –
Strong stuff, I used 1 scoop and felt very intense and good
Michael B –
This is my first time trying a pre-workout. I did some research first, and this looked good. It tastes not bad considering there is no sugar. I did a full scoop the first time, and I had really itchy skin half way through my workout for a few minutes. I didn’t notice a huge difference in performance but Ill keep using it and see how I get along with PB’s.
Nick S –
I have such a high caffeine tolerance and have tried every pre workout on the market in the last 10 years and this stuff is absolutely the best pre workout I’ve ever had and actually works every time I use it !
Vincente G –
It is excellent. I have noticed the difference. I feel more energy and strength.
Scott D –
Not bad, it does its job.
Logan K –
I am extremely picky when it comes to pre workout, and I am a huge fan of this stuff!!! Gives me all the energy for a heavy lift and the taste is so good. Recommend for sure!