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  (3,910 Reviews)
2 Sizes
20 Servings
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7 Flavors
Black Cherry
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Price: CA$48.99  (CA$2.45 / Serving)
Flavor Rating: 6.3

Product Overview

JYM Pre Jym.

"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, has revolutionized 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 amounts, 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 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 amounts of each ingredient secret so no other company steals the formula.

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

Pre JYM doesn't use proprietary blends. Take a look at the supplement facts panel and you'll see the actual amounts of all 13 ingredients. I have nothing to hide. I'm proud of the amount of each and every ingredient I've included.

Proper Amounts

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

Take citrulline malate, for example. The research on this potent amino acid shows that you need 6 grams per serving. Most pre-workout products leave out citrulline entirely, and only a few of them provide anywhere close to 6 grams.

No "Abbreviated" Formulas

A handful of companies are as fed up as I am with proprietary blends and under-dosed 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 complement one another to prime the body for intense workouts, making it a complete pre-workout supplement. If you're looking for the most complete exercise supplement program available on the market today, take my Post JYM Active Matrix after your workout to get even greater amounts of potent ingredients like Creatine HCl, Betaine, and Beta-Alanine.

No Concentrates

Some 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 serving? They didn't use any magic, which is why some 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 amounts.

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 amounts suggested to help build lean muscle, torch body fat, improve strength, and boost speed.*

Pre JYM Active Ingredients Matrix Features
  • Full amounts of 13 science-backed ingredients.
  • 6 grams of citrulline malate to help promote better muscle endurance and bigger muscle pumps.*
  • 6 grams of BCAAs in the 2:1:1 ratio for blunting muscle fatigue, boosting muscle performance, and increasing muscle growth.*
  • 2 grams of Con-Cret® Patented 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 Beet Root extract to enhance nitric oxide for bigger pumps and better energy.*
  • 300 milligrams of caffeine to help 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 amounts 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.
  • Research suggests that leucine is the most critical because it stimulates muscle protein synthesis (i.e., muscle growth).*
  • Studies suggest 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
  • 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. Studies have shown that citrulline does not, so whatever you consume is readily absorbed and put to use.*
  • Citrulline malate has also been shown to be an effective energy booster. One study reported that subjects consuming 6 grams of citrulline malate experienced an increase in ATP (energy) production during exercise and an increase in phosphocreatine recovery between bouts of exercise.*
  • Research also suggests that subjects supplementing with citrulline malate before a chest workout could complete more reps on most sets compared to subjects taking a placebo.
2 grams of Con-Cret® Patented Creatine HCl
  • There are many 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 may help increase its absorption and help to reduce 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 increased further when taken together with creatine, as in Post JYM Active Ingredients Matrix™.
  • One study suggested that beta-alanine supplementation in boxers increased their average punching power in the last 10 seconds of a round 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 root extract is a rich source of nitrates. When you consume nitrates, they are broken down first to nitrites and then to nitric oxide (NO).
  • Beet root extract is a direct supplier of NO and uses a different pathway to produce NO than citrulline and arginine!*
  • Research suggests that nitrates can improve blood flow to working muscles and the brain.* The result is greater training intensity and endurance, and increased 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 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 power and muscle force on the bench press.*
  • Betaine has also been shown to significantly increase protein synthesis following workouts as compared to a placebo. This can help lead to greater long term muscle growth.*
300mg of AlphaSize® Delivering 150mg of 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 helps boost 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 lasts throughout workouts.*
600mg of N-Acetyl L-Cysteine (NAC)
  • NAC is the amino acid cysteine with an acetyl group attached to it. Studies have suggested that 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 shows that caffeine can 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 contains standardized amounts of the active ingredient piperine.
1.5g of Tyrosine
  • This amino acid promotes increased 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 proper amount of taurine after every workout to replenish what was lost.*
JYM Supplement Science

Ratings & Reviews

Overall Rating
3,910 Ratings
Verified Buyer Rating
3,441 Ratings
Average Flavor Rating
9 Flavors
Top Rated Flavor
Pineapple Strawberry
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.
Jan 16, 2019
Verified Buyer
  • 3 Orange Mango

I have been using the Pre Jym, Pro Jym and Post Jym on a stack now for a couple weeks and it has been wreaking havoc on my bowels. I am not sure if it is because it is “cleansing” me or if my body just doesn’t agree with it. I literally am having straight liquid come out of my a-hole about an hour or hour and a half after my workouts and am going to the toilet 4-5 times a day now. I am using it as directed. Mixing Pre Jym with water, letting it set for 15 minutes, drinking it over the course of 15 minutes and consuming it 30 minutes before my workouts. Pro Jym is mixed with non-fat milk and consumed 30 minutes after work out. Post Jym is mixed with water, let stand for 15 minutes and then consumed directly after my Pro Jym and within 40-45 minutes after my workout. No other supplement stack I have ever taken has done this to me. For now, it isn’t too bad because I can be close to a bathroom at all times, but that won’t always be the case. Additionally, the Pre Jym doesn’t seem like it gives me the energy for my pumps. I had been taking NeuroCore pre-workout and while it did give me the jitters and made me feel like I wanted to claw my face off sometimes, it worked amazing in the gym when pumping some weight. Pre Jym doesn’t feel like that and I feel like I am falling flat on my pumps. I think that once I have used up the product that I currently have of the Jym line, I won’t be ordering again. Probably a good product, and probably better for me as opposed to other stuff I have been using, but I like results and I want to feel good about what I am using. Right now, I just don’t feel good with Jym.

Jan 11, 2019
Verified Buyer
  • 10 Pineapple Strawberry
  • 10 Refreshing Melon
  • 10 Strawberry Kiwi

Amazing product. I love that all ingredients are listed and you know exactly what you are taking. I feel great during my workout and definitely gives me the extra I need and want. I also use half a serving as an energy drink when feel slow or tired. Video on this ideology in the yt. Great taste wonderful feeling couldn’t ask for a better product.

Jan 08, 2019
Verified Buyer

By far one of the best products on the market. The first generation of jym products were better by much to say. In fact still love the new line but would have hoped to bring the old school products back really missed that. Will continue to keep using the pre jym for a long time because even now still by far better than many cheap little Mickey Mouse pre workouts that all the wall is name and not product like pre jym with a clear and consistent transparency.

Jan 08, 2019
Verified Buyer
  • 6 Pineapple Strawberry

Pineapple strawberry is VERY sweet. Was hard to get through. I aso personally did not feel this preworkout as much as I like to, and didn’t get as great of a pump from it.

Jan 06, 2019
  • 2 Black Cherry

doesn't matter what flavor you choose, look at the ingredients and google them. Carrageenan? Seriously!

Jan 04, 2019
Verified Buyer
  • 9 Orange Mango

Very good product, I have always used MyProtein products, but thought it was time for a change during the black Friday deals. You still get that tingling feel within your face, however its nowhere near as overwhelming as previously used products. Great tasting, not even slightly bitty. However, I find it to be very sour. Only issues is, £40 is a lot of money. Regardless of how good the product is! But will definitely be using this product again

Jan 04, 2019
Verified Buyer
  • 9 Raspberry Lemonade
Jan 01, 2019
  • 4 Cherry Limeade

Didn't feel much from this pre-workout. Ive used it for a week. The Cherry Limeade is way to sour and tart. I would not recommend this flavor or pre-workout.

Dec 19, 2018
Verified Buyer
  • 10 Rainbow Sherbet
  • 9 Natural Island Punch

Nutrition and exercise are key to a healthy lifestyle.. as supplements are not a need,but a privilege i would say this is one product i think needs to be a need.. there is a lot of things we no longer receive in the foods we eat anymore because of all of the processing.. I use pre Jym off and on when i have the extra money to afford it. i will say they flavors always on point and i always feel amazing during my workouts... i have taken many different Pre workouts and you can tell a HUGE difference between one that just has a bunch of junk and one that authentic ingredients and the correct dosing.. if you pair this up with post Jym and Pro Jym you will have almost everything you need.. i have never gotten results ,nor seen changes happen as fast as i have when i take Jim Stoppani products.. i cant always afford these products,but when i do its nothing but JYM products for me... Why settle for mediocre when you can have the best there is on the market...The flavor is on point, it mixes extremely smooth if you follow directions and allow the Creatine to dissolve and not try to power slam it.. savor it, taste it, enjoy it and then crush your workout...

Dec 14, 2018
Verified Buyer
  • 9 Raspberry Lemonade
  • 8 Orange Mango

I’ve been using this product for about two months. It mixes well, tastes good and seems to work as well as any pre-workout I’ve used. My only complaint is that I haven’t gotten 30 servings out of a tub. I always run out of my pre.workout before my post-workout.

Dec 08, 2018
  • 7 Natural Island Punch
  • 8 Cherry Limeade

Supplement: Fantastic. Noticeable (feel it), and quantifiable (Better quality workouts, increase lifting out put. log your stuff and you'll see it over a short span of time) Taste: Acquired :) But not bad by any means

Dec 02, 2018
Verified Buyer
  • 8 Black Cherry
  • 8 Cherry Limeade
  • 7 Raspberry Lemonade
Nov 21, 2018
Verified Buyer
  • 10 Pineapple Strawberry

As a consumer of supplements for 20 years. (I'm 39) I have tried everything under the sun. I have been using the Jym preworkout for over a year now and can say that hands down, this stuff is amazing. Zero crash, sustainable energy throughout my workouts, and ingredients that I can trust. The lazer like focus that this product gives me has made it a staple to not only my workout supplementation, but it has also became my daily energy drink. Orange Mango and Pinapple Strawberry are amazing!!

Nov 17, 2018
Verified Buyer
  • 10 Black Cherry
  • 10 Cherry Limeade

This product is great! My first review, I'm 55 lifting for 30 yrs.Tried hundreds of sups. Most pre's do nothing or give you the jitters so bad you can't focus. I use full scoop, after approx 20min i can feel it, but nothing ridiculous, My pumps are longer, my sets and reps are longer.while its not the cheapest. It's the best I have found for a long time. I will definitely aquire and test some more of JYM's supplement's.

Nov 16, 2018
  • 7 Black Cherry
  • 1 Rainbow Sherbet

This is the best pre-workout hands down. The first time I tried it I seen results instantly. After I ran out I tried other pre-workouts and they did not come close to JYM so I went back to it and felt great and haven't stopped using it since.

What's in JYM Supplement Science Pre JYM

20 Servings Black Cherry
Serving Size: 1 Scoop (26g)
Servings Per Container: About 20
Amount Per Serving % Daily Value
Calories 80       
Sodium 10 mg <1%
Total Carbohydrate 3 g 1%**
Total Sugars 2 g       
Includes 2g Added Sugars 4%
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, 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.
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