JYM Supplement Science


Pre-Workout Powder Powerhouse Packed with 13-Hand Picked Ingredients to Support Improved Workouts*
A Cutting-Edge Pre-Workout Formula Built on Solid Science*
9.1  out of 10  (3,970 Reviews)
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Product Overview

True Performance Pre-Workout

Energy, Pump, Endurance, Strength*

Dr. Jim Stoppani Jim Stoppani Signature
Pre JYM Container

5 Must-Have Ingredients

  • 6g BCAAs
  • 2g Creatine HCl
  • 1.5g Betaine
  • 2g Beta-Alanine
  • 6g Citrulline Malate

Pre JYM™ Changed The Supplement Industry

Upon introduction in 2013, Pre JYM ushered in an era of transparency and became known as the world’s first high-performance Pre-Workout supplement. Pre JYM was designed by renowned exercise and nutrition scientist Dr. Jim Stoppani to allow dedicated athletes to unlock the critical elements to fitness success: motivation, performance, transformation, and growth.*

13 Hand-Picked Ingredients

Pre JYM includes 13 ingredients that complement one another to prime the body for intense workouts, making it a complete pre-workout supplement. When it comes to supplement formulation, it is important to understand how synergies work. Certain ingredients work well when combined with other ingredients. This is where many supplement companies fall down. with PRE JYM, I personally selected these 13 quality ingredients that have fueled my workouts and those whom have applied my advice for years. As a scientist and bodybuilder, I understand how to combine both science and real use to attain real results.

No Proprietary Blends

Look at the Supplement Facts panel of your current pre-workout product and you'll likely see "proprietary blend," "pump matrix," "performance blend," or other catchy name in lieu of listing all ingredients and precise doses of each. Some supplement companies want you to think this means they've created a special concoction that magically delivers unique results. Because this blend is so amazing, they have to keep the amounts of each ingredient secret so that no other company steals the formula.

Truth is, proprietary blends typically serve a different purpose: They allow companies to hide how little of each ingredient they've actually put in the product. These ingredients are often cheap, ineffective, under-dosed, or all of the above. Pre JYM doesn't use proprietary blends – never has, never will. All 13 ingredients with exact doses that are clearly listed on the label. You deserve to know exactly what ingredients, and how much of each, are in the product you buy. Proprietary blends serve the purpose of hiding what’s in the product, plain and simple.


Get stronger in the gym and train harder and longer. Pre JYM will help you do it with ingredients that promote energy, focus, and stamina. Set PR’s in all areas with Pre JYM as your high-performance training fuel.*


Gaining muscle helps support all goals – strength, physique, weight loss, and overall health and wellness. Pre JYM will spearhead your growth efforts with nutrients, not stimulants, that ignite protein synthesis to help you build more lean muscle.*

Nutrients vs. Stimulants

Your pre-workout should contain real nutrients that deliver real results, not various stimulants that do nothing more than get you temporarily “amped up.” The Pre JYM formula is based on amino acids (the building blocks of protein) that fuel your muscles and provide “clean energy.” The only stimulant in Pre JYM is caffeine, selected for its performance-enhancing benefits, not simply to give you a jolt. Pre JYM changed an entire sports nutrition category when it launched in 2013. Before then, pre-workouts were loaded with stimulants you couldn’t pronounce that gave you the jitters and little else. Stimulants provide a temporary boost. Nutrients, on the other hand, are the foundation for real gains in strength, muscle-building, endurance, and overall performance. Pre JYM was the first ever true performance pre-workout, and years after changing the industry, it’s still the product smart consumers choose to fuel their muscles, and their goals, with actual nutrients.

No BS, Just Science

I've been studying nutrition and supplement science both in the lab and in the gym for decades. I’ve done the research, and I’ve converted it into real results for millions of real people just like yourself. I began educating hard-training men and women worldwide through the pages of Muscle & Fitness, FLEX, and Muscle & Fitness Hers magazines before finding a home for my programs, articles, and videos here on I developed Pre JYM back in 2013 to take the results to the next level and provide myself and anyone else training hard in the gym the ability to access, in one bottle, the best supplement ingredients to help build lean muscle, torch body fat, improve strength, and boost performance.*

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Ratings & Reviews

Overall Rating
3,970 Ratings
Verified Buyer Rating
3,489 Ratings
Average Flavor Rating
10 Flavors
Top Rated Flavor
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Jun 18, 2019
  • 8 Orange Mango

When I started lifting I was using a different pre workout I decided to switch to the jym legacy stack I've been using the stack about 2 months now and have not been disappointed yet. I could tell the difference from the other brand I was using. I get a better pump during my workouts and have enough energy after working all day

Jun 07, 2019
  • 10 Tangerine

Best pre workout hands down. Backed by science, proven to show real results and give your body the ingredients necessary to make it through the toughest workouts. Also, the tangerine flavor is amazing! Not super sweet, but super delicious! 10/10 !

Jun 05, 2019
Verified Buyer
  • 1 Raspberry Lemonade

Too much hype for an ineffective pre-workout. Very upset with this product.

May 30, 2019
Verified Buyer
  • 10 Cherry Limeade
  • 10 Raspberry Lemonade

Great taste and mixes well. No chalky residue. Gives great energy, focus and pump. Love it.

May 28, 2019
Verified Buyer
  • 10 Tangerine
  • 10 Black Cherry
  • 10 Orange Mango
  • 10 Refreshing Melon

Best pre-workout I've ever used. No 'mad rush' or 'jacked' feeling, but that doesn't do anything except make you think it's doing something. Clean energy here, enough to power this 40 something through 2+ hour workouts after a full day of work without a crash or jittery feeling at all. The new Tangerine flavor is absolutely amazing! Mix per the directions, add ice, tastes just like you're biting into a fresh tangerine! Unseated my prior go-to's Black Cherry, Refreshing Melon, and Orange Mango. Don't forget to pair this up with PostJYM for the full effect and added recovery benefits!

May 27, 2019
Verified Buyer
  • 1 Black Cherry

Didn't work for me.

May 26, 2019
Verified Buyer
  • 10 Pineapple Strawberry
  • 10 Rainbow Sherbet

Great energy and focus love it

May 25, 2019
  • 6 Tangerine

Great pre-workout, but dissapointed with Jim just recycling flavors. Comes out with "new" flavors (strawberry pineapple, pink lemonade, tangerine). Already has a strawberry kiwi, raspberry lemonade, and an orange mango pre-jym/mandarine orange post jym. They're slightly different from each other, but your customers want something ENTIRELY new. Give us blue raspberry, sour apple, etc. Not something that tastes just barely different from another one of your products. Besides my dissapointment with the lack of change in flavors, it's a fantastic pre workout.

May 22, 2019
Verified Buyer
  • 9 Tangerine

The product works good and I enjoy the flavor. My only problem is the after taste resembles and makes me think of chicken wings in blue cheese. Not necessary a bad thing, just crazy.

May 21, 2019
Verified Buyer
  • 10 Tangerine

This is the most natural tangerine flavor I’ve ever had other than actual tangerines. Doc killed this flavor of Prejym!!!

May 21, 2019
Verified Buyer
  • 10 Tangerine

Just tried the Tangerine. The Jym Team hit a homer in with this one. It’s really smooth, not as strong as some of the flavors. Not over sweet. It’s really delicious!! Might be my favorite.

May 20, 2019
Verified Buyer
  • 8 Tangerine

This flavor certainly taste like a tangerine. It is not as sweet as Orange Mango and not as tart or sour as Pink Lemonade. It has a refreshing taste to it and is well-suited for a morning workout pre-workout drink. No matter the flavor, this is still the best pre-workout I have used and I have not used any other pre-workout since Cherry Limeade was the first flavor released years ago.

May 20, 2019
Verified Buyer
  • 10 Orange Mango
  • 10 Pineapple Strawberry
  • 9 Rainbow Sherbet
  • 9 Refreshing Melon

The best pre workout on the market, with the perfect dosing of everything you need, when you pair it with the post workout. Orange Mango has to be the best flavor I have ever tried, and the wife and kids love it too!

May 18, 2019
Verified Buyer
  • 10 Orange Mango
  • 7 Cherry Limeade

Amazing pre-workout with the correct doses of critical ingredients needed to supplement your training. The Orange Mango flavor is by far one of the best supplement flavors I've ever had. The Cherry Limeade is also good, but the Orange Mango is certainly a cut above! I also use: PostJym, VitaJym, OmegaJym, ZMAJym, ShredJym, and ProJym.

May 17, 2019
Verified Buyer
  • 7 Tangerine

Tangerine is a pretty decent flavor. It tastes like a tangerine, it's tart, and not too sweet. Orange Mango is definitely better. Leaves a weird feeling in the back of my throat. As far as effectiveness, Pre Jym is solid.

2 Sizes
20 Servings
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8 Flavors
Rainbow Sherbet
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Price: $37.99  ($1.90 / Serving)
Flavor Rating: 7.6

What's in JYM Supplement Science Pre JYM

20 Servings Rainbow Sherbet
Serving Size: 1 Scoop (27g)
Servings Per Container: About 20
Amount Per Serving % Daily Value
Calories 80       
Sodium 240 mg 10%
Total Carbohydrate 3 g 1%**
Total Sugars 2 g
Includes 2g Added Sugars 4%
Calcium 5 mg 1%
Creatine HCl (as CON-CRET®) 2 g
Beta-Alanine (as CarnoSyn®) 2 g
Betaine (Trimethylglycine) 1.5 g
Taurine 1 g
N-Acetyl-L-Cysteine 600 mg
Alpha-Glyceryl Phosphoryl Choline (as AlphaSize®) 150 mg
Citrulline Malate 6 g
Beet (Beta vulgaris L.) Root Extract 500 mg
L-Leucine 3 g
L-Isoleucine 1.5 g
L-Valine 1.5 g
L-Tyrosine 1.5 g
Caffeine Anhydrous 300 mg
Huperzine A [from Toothed Clubmoss (Huperzia serrata) Aerial Parts Extract] 50 mcg
Black Pepper (Piper nigrum) Fruit Extract (as BioPerine®) 5 mg
** The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
† Daily Value not established
Dextrose, Natural and Artificial Flavors, Disodium Phosphate, Sucralose, Acesulfame Potassium, FD&C Red No. 40, FD&C Blue No. 1.
ALLERGEN WARNING: Produced on shared equipment that also produces products that may contain EGG, MILK, SOY, TREE NUTS, and WHEAT.

Directions For Pre JYM: Mix 1 scoop of Pre JYM in 14oz. of water and drink 30-45 minutes before workouts.

Warnings: Check with a qualified healthcare professional before taking this product. Do not use if you are sensitive to caffeine, pregnant or nursing a baby, under 18 years of age, have any known or suspected medical conditions, and/or if you are taking any prescription or OTC medications. Pre JYM is an incredibly strong pre-workout matrix that contains 300mg caffeine per serving, the equivalent of approximately 3 cups of coffee. Avoid using with any other caffeinated products. Too much caffeine may cause nervousness, irritability, sleeplessness, and, occasionally, rapid heartbeat. Always begin use with 1/2 scoop or less and assess your tolerance. Once tolerance is assessed, take a maximum dose of 1 scoop. To avoid sleeplessness, do not consume within 6 hours of bedtime. Concerning California Residents: This product contains chemicals known to the State of California to cause cancer and birth defects or reproductive harm. KEEP OUT OF REACH OF CHILDREN.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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