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*
9.0 out of 10 (4,339 Reviews)
2 Sizes
20 Servings
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8 Flavors
Black Cherry
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Price: $37.99 ($1.90 / Serving)
Flavor Rating: 5.3

Product Overview

JYM Pre Jym. The Most Effective All-In-One Pre-Workout Formula

"Welcome to my latest creation, JYM Supplement Science. JYM combines real science with real ingredients to deliver unreal results. Pre JYM, my cutting-edge pre-workout product, is poised to revolutionize the pre-workout category."

Supplement companies love to claim they've created a real “game-changer.” Pre JYM doesn't play that game. It doesn't need hype or flashy marketing. With 13 hand-picked ingredients included at full doses, Pre JYM is in a league of its own.

Put simply, Pre JYM is the most effective pre-workout supplement I've ever developed. It's built on solid science, years of study, and decades of professional experience. Nothing is hidden, and there is no filler. Pre JYM is research made real. It's pure pre-workout fuel."

Hit the JYM!

Jim Stoppani, PhD
Owner, JYM Supplement Science

The Power of Pre JYM
No Proprietary Blends

Look at the supplement facts panel on your favorite pre-workout product and you'll most likely see the term “proprietary blend.” Supplement companies want you to think this means they've created a special blend of ingredients that magically work together to deliver unique results. Because this blend is so amazing, they have to keep the doses of each ingredient secret so no other company steals the formula.

The truth, however, is that propriety blends serve a different purpose. They allow supplement companies to hide how little of each ingredient they've actually put in a product. This results in cheap, underdosed, ineffective supplements.

Pre JYM doesn't use proprietary blends. Take a look at its supplement facts pane and you'll see the actual doses of all 13 ingredients. I have nothing to hide. I'm proud of the amount of each and every ingredient I've included. Together, those 13 ingredients in those exact doses are the closest thing to a magical formula that you're going to find.

Proper Doses

For the reasons detailed above, many supplement companies are moving toward transparency and axing proprietary blends. That's a good thing. However, these companies are still guilty of grossly underdosing ingredients.

Take citrulline malate, for example. The research on this potent amino acid shows that you need 6 grams per dose. Most pre-workout products leave out citrulline entirely, and none of them provide anywhere close to 6 grams. Until now.

No "Abbreviated" Formulas

A handful of companies are as fed up as I am with proprietary blends and underdosed formulas, but they fall short by using “abbreviated” formulas. An abbreviated formula is one that uses proper dosing of all ingredients, but only includes a few ingredients.

Take, for example, a pre-workout formula that includes beta-alanine, creatine, caffeine, and tyrosine. There's nothing wrong with it, but it could be made a lot more effective through the addition of ingredients like citrulline malate, betaine, and BCAAs, to name just a few. Why would companies not create the most robust formula possible? Because adding more ingredients costs too much money.

Pre JYM includes 13 ingredients that work in concert to prime the body for intense workouts, making it the most complete pre-workout supplement available.* If you're looking for the most complete exercise nutrition program available on the market today, take my Post JYM Active Matrix after workout to get even greater doses of potent ingredients like Creatine HCl, Betaine, and Beta-Alanine.

No Concentrates

Many companies also try to trick buyers by calling their pre-workout product “concentrated.” A serving of one of these “concentrated” products can contain as few as 3 to 6 grams of powder. What kind of magic did they use to cram enough creatine, beta-alanine, citrulline, arginine, caffeine, and other ingredients into that tiny dose? They didn't use any magic, which is why all of those “concentrated” formulas also include proprietary blends. That's also why the serving size of Pre JYM is more than 26 grams. It contains 13 ingredients at proper, powerful doses.

JS, Not BS

I've been studying supplement science in the lab and gym for decades. I've been delivering supplement advice to millions of people in the pages of Muscle & Fitness, FLEX, and Muscle & Fitness Hers, as well as here on and my own website,, for over a decade.

Most importantly, I've been training since I was 11 years old. Before each of my workouts, I would draw on all of my experience and all of my education to concoct my own pre-workout supplement, combining ingredients from 13 different bottles and tubs.

That's why I developed Pre JYM. I wanted to give my friends, colleagues, all of you, and myself the ability to access, in one bottle, the best ingredients in the exact doses suggested to help build lean muscle, torch body fat, improve strength, and boost speed.*

Pre JYM Active Ingredients Matrix Features
  • Full doses of 13 science-backed ingredients.
  • 6 grams of citrulline malate to promote better muscle endurance and bigger muscle pumps.*
  • 6 grams of BCAAs in the 2:1:1 ratio best for blunting muscle fatigue, boosting muscle performance, and increasing muscle growth.*
  • 2 grams of creatine HCL for greater strength, endurance, and muscle growth.*
  • 2 grams of CarnoSyn® beta-alanine to boost muscle power, strength, endurance, and muscle growth.*
  • 1.5 grams of betaine for greater power and strength during workouts.*
  • 600 milligrams of N-acetyl L-cysteine to support your body's amino acid profile during exercise.*
  • 500 milligrams of betavulgaris L.(beet) extract to provide real nitric oxide donors for bigger pumps and better energy.*
  • 300 milligrams of caffeine to boost alertness and drive, increase muscle strength and endurance, during workouts for greater training intensity.*
  • 150 milligrams of AlphaSize® alpha-GPC for better drive, focus, and strength in the gym.*
  • 50 micrograms of huperzine A to increase mental focus and establish a stronger mind-muscle connection.*
  • 5 milligrams of BioPerine® to enhance absorption of nutrients for even better results.*

Under the Microscope

Let's take a closer look some of the ingredients and doses used to make Pre JYM such a pre-workout powerhouse.*

6 grams of Branched-Chain Amino Acids (BCAAs)
  • The BCAAs are three amino acids—leucine, isoleucine, and valine—that share a common structure.
  • Leucine is the most critical because it stimulates muscle protein synthesis (i.e., muscle growth).*
  • The optimal ratio of leucine to isoleucine to valine in a pre-workout product is 2:1:1, exactly the ratio in Pre JYM.
6 grams of Citrulline Malate
  • Citrulline malate is composed of the amino acid citrulline attached to malic acid (malate).In the body, citrulline is readily converted to arginine, and then to nitric oxide (NO). Research suggests that citrulline increases arginine and NO levels in the body better than arginine itself.* Arginine undergoes excessive breakdown by the intestines and liver. Citrulline does not, so whatever you consume is readily absorbed and put to use.*
  • Citrulline malate is also a proven energy booster. One study reported that subjects consuming 6 grams of citrulline malate for 15 days experienced a 35% increase in ATP (energy) production during exercise and a 20% increase in phosphocreatine recovery between bouts of exercise.*
  • Research also suggests that subjects supplementing with citrulline malate before a chest workout could complete at least one to two more reps on most sets compared to subjects taking a placebo.
2 grams of Creatine HCL
  • There are hundreds of studies suggesting that creatine supplementation leads to significant gains in muscle strength and power, as well as muscle growth.*
  • Creatine HCL is made by attaching a hydrochloride (HCL) group to creatine.
  • Adding the hydrochloride group lowers the pH of creatine, making it more acidic. This drastically increases creatine's solubility in fluids, which increases its absorption and reduces stomach issues.*
2 grams of CarnoSyn® Beta-Alanine
  • Beta-alanine is an amino acid that gets taken up by muscle fibers and combines with the amino acid histidine to form carnosine.*
  • Research suggests that carnosine increases strength and power, improves endurance and recovery, and muscle growth.* This is especially true when taken together with creatine, as in Post JYM.
  • One study suggested that four weeks of beta-alanine supplementation in boxers increased their average punching power in the last 10 seconds of a round by 2,000 percent more than those taking a placebo. Being able to maintain punching power late in the round is similar to maintaining more strength and power later in your workouts, meaning you can lift more weight for more reps.*
500 mg of Beta Vulgaris L. (Beet) Extract
  • Beet extract is a rich source of nitrates. When you consume nitrates, they are broken down first to nitrites and then to nitric oxide (NO).
  • This means that beet extract is a direct supplier of NO and uses a different pathway to produce NO than citrulline and arginine!*
  • Research suggests that nitrates improve blood flow to working muscles and the brain.* The result is greater training intensity and endurance, and better brain function and focus during workouts.*
  • Research has also found that nitrates can directly improve the muscle's ability to generate ATP (energy) to further improve endurance during intense exercise, such as lifting weights.*
1.5 grams of Betaine
  • Betaine, also known as trimethylglycine (TMG), is a modified version of the amino acid glycine.
  • Betaine supplementation has been suggested in clinical studies to improve muscle strength and power production, increase the number of reps done with a given weight, and improve endurance.*
  • University of Connecticut researchers reported that supplementing with 1.25 grams of betaine twice per day for two weeks increased bench press power by 20 percent and muscle force on the bench press by 25 percent.*
  • Betaine has also been shown to significantly increase protein synthesis following workouts as compared to a placebo. This can help lead to greater muscle growth in the long term.*
300mg of AlphaSize® Alpha-Glyceryl phosphoryl choline (Alpha-GPC)
  • Alpha-glyceryl phosphoryl choline (alpha-GPC) is a naturally occurring phospholipid compound that plays a critical role in the way the brain, nervous system, and muscles function.
  • Alpha-GPC boosts brain function and mood, improves reaction time, and helps increase focus and the mind-muscle connection during workouts.*
  • When combined with caffeine, L-tyrosine, and huperzine A (all found in Pre JYM), alpha-GPC delivers clean mental stimulation and focus that last throughout workouts with no crash.*
600mg of N-Acetyl L-Cysteine (NAC)
  • NAC is the amino acid cysteine with an acetyl group attached to it. The acetyl group makes it more stable and allows the body to absorb and use it better than plain cysteine.*
50mcg of Huperzine A
  • This extract from club moss is a potent brain booster that can promote better focus, enhanced memory, and elevated mood.*
  • Huperzine A helps maintain higher levels of acetylcholine, which is important for brain and muscle function.*
  • Combining it with alpha-GPC, which increases acetylcholine levels, has an additive effect, resulting in enhanced drive and focus in the gym, as well as increased muscle strength and endurance.*
300mg of Caffeine
  • Research confirms that caffeine can immediately increase muscle strength, improve muscle endurance, and decrease muscle fatigue during workouts, which allows you to take your training intensity to a higher level.*
  • Caffeine is also suggested to be a nitric oxide (NO) booster. One study in the American Journal of Cardiology reported that healthy young men taking 300 mg of caffeine experienced an increase in NO levels and an increase in blood flow to muscles.*
5 mg of BioPerine®
  • BioPerine® is a patented extract of the fruit of black pepper, or long pepper, that contain standardized amounts of the active ingredient piperine.
1.5g of Tyrosine
  • This amino acid increases alertness, mental focus, mood, and energy during intense exercise, especially when combined with caffeine.*
1,000 mg of Taurine
  • Taurine is a specialized amino acid that is important for endurance and muscle strength.*
  • Exercise depletes taurine levels, thereby impairing strength and endurance, so it's critical to get a dose of taurine after every workout to replenish what was lost.*
JYM Supplement Science

Ratings & Reviews

Overall Rating
4,339 Ratings
Verified Buyer Rating
3,820 Ratings
Average Flavor Rating
8 Flavors
Top Rated Flavor
Cherry Limeade
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.
Verified Buyer
  • 5 Orange Mango

This has been my tried and true pre-workout for over a year now. The only problem I have with it is that, after a while, you grow used to it's punch effect. When I started taking it, I took the recommended 1-scoop serving and within minutes I was pumped up and ready to lift. As of lately, I've found that the "punch" oh taking this isn't as strong anymore, which I'm sure is the case with any pre workout you take before workouts. One thing I do enjoy about this product is that it doesn't leaving you with a crash after a workout. I've found that I can push my every limit at the gym with this, recover for a half hour, and be just as alert as I was before I took it. The orange mango flavor is definitely not their best flavor, but it tastes good going down. The aftertaste is wretched though and it lingers for a few hours in my experience. Overall, this is a great product that has guaranteed punch. How much of a punch is varied over time though.

  • 8 Natural Island Punch
  • 1 Rainbow Sherbet

I love Rainbow Sherbet. I tried Natural Island Punch and it wasn’t bad but it was too tangy for my taste. Pre Jym is definitely better than coffee or energy drinks. It wakes me right up and gives me energy throughout the day. Depending on your caffeine tolerance, you may only need 1 scoop and others may need more than 1 scoop. 1 scoop works for me. If you aren't used to taking Pre Jym, in the beginning, you may experience tingly or itchy hands. I asked about that and was told there’s something in the Pre Jym (sorry, I don’t remember what specifically) that has to build up in your system. It does go away.

Verified Buyer
  • 4 Orange Mango

I am not sure if it was because I brushed my teeth 45 min prior to taking the pre workout but it tasted like garbage. I wish they would go back to their original formula. Don't fix something that isn't broken.

Verified Buyer

This product doesn't mix well with water no matter how I tried it... very gritty and foamy. Also, I don't feel a thing. Compared to C4 Extreme, this just does not cut it for me.

Verified Buyer
  • 7 Black Cherry
  • 8 Refreshing Melon
  • 10 Cherry Limeade
  • 7 Rainbow Sherbet

This is a very effective pre workout, Cherry limeade is delicious, I love the ingredient profile, maybe a bit more beta alanine and this would be close to perfect in my book.

Verified Buyer
  • 9 Orange Mango

The flavor is great in this one. But something is different than before. I am not getting the kick from pre jym anymore. I used to with the old formula/design, now, my reps are lagging, the energy is not there. Going to be researching a new formula soon.

Verified Buyer

It pains me to give this a 5 but it would be unfair to rate it any higher. I am part of the Jym Army but I am highly disappointed in the 2.0 products by Jym. I am also highly disappointed that all of our reviews are falling on deaf ears - apparently we are just complaining to each other. Dr. Stoppani specifically mentioned on his Instagram page that the blend hasn't changed. There is no question it has, I have more unmixed, white chunks at the bottom of my water bottle with the 2.0 than any other pre I have ever taken. Is this filler or is it what they use to make the flavor taste so bad now? Please just bring back the old stuff - I've even been adding Orange Mango drink mixes from Food Lion to try and help the flavor. Ugh......guess I'll try MuacleTech

Verified Buyer
  • 1 Black Cherry
  • 1 Refreshing Melon
  • 1 Natural Island Punch
  • 10 Orange Mango
  • 10 Raspberry Lemonade
  • 10 Cherry Limeade
  • 1 Rainbow Sherbet
  • 1 Strawberry Kiwi

These 2.0 flavors for pre and post jym are awful. The legacy flavors aren't as good as they used to be but they're still better than the 2.0

Verified Buyer
  • 4 Orange Mango
  • 4 Raspberry Lemonade
  • 4 Strawberry Kiwi

I've been a Jym Pre Workout users from the beginning. It's still a good product, but I'm seriously bummed about the flavor of JYM 2.0 Pre Workout and Protein. I loved the original Orange Mango. I thought I was getting the same product when I ordered the 2.0, and I crossed my fingers that it wasn't the same bad tasting and poor mixing clumpy formula sold a GNC -- it was. I don't drink supplements for the flavor, but it's always a plus when something tastes good. Anyway, I'll be weaning myself off my caffeine addiction thanks to the less-than-desireble flavor.

  • 1 Natural Island Punch

What happened? I used to love pre jym, but jesus christ this new flavor makes me want to vomit. Please bring back the original flavors!

Verified Buyer
  • 8 Black Cherry

I have to say I’ve used this product for Atleast 4 months now, and it really works well as a pre workout. It helps me push through some intense workouts, but i recently read the labels and it says it’s made with chemicals that can cause cancer. I won’t be taking this pre workout again. Oh

Verified Buyer
  • 1 Cherry Limeade

Please go back to the old formulation for cherry limeade. The new flavor tastes awful. Tastes nothing like cherry, or lime for that matter. I’ve even had other people who’ve never tried it tell me what flavor they think it is...I’ve gotten responses from fruit punch to bubble gum.

Verified Buyer

The taste on the Orange Mango and Cherry Limeade have definitely. They don't taste remotely like they once did or like the flavor description. If you are a long time user looking forward to those be warned.

Verified Buyer
  • 1 Cherry Limeade

I have been using the cherry limeade flavor for years, however, this is not the same flavor. Why would they change the flavor when it was pretty much perfect before? I would warn anyone who has used cherry limeade in the past that this isn’t anywhere near what it used to be and order a different brand.


First few uses was good but stopped feeling anything after the 3rd or 4th time... not sure why there’s BCAAs in a pre work out either especially since your BCAAs are used for protein synthesis which you primarily take after your work out...

What's in JYM Supplement Science Pre JYM

Serving Size: 1 Scoop (26g)
Servings Per Container: About 20
Amount Per Serving % Daily Value
Calories 80       
Total Carbohydrate 3 g 1%**
Sugars 2 g
Calcium 45 mg 5%
Sodium 10 mg 1%
Creatine Hydrochloride 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 (Huperzia serrata) Extract 50 mcg
Black Pepper (Piper nigrum) Fruit Extract (as Bioperine®) 5 mg
** Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value not established
Dextrose, Natural and Artificial Flavors, Sucralose, Acesulfame Potassium, Caramel Color, FD&C Red #40, FD&C Blue #1, Calcium Silicate.
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.