Pre JYM
JYM Supplement Science

Pre JYM

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 (4,372 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: 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 Bodybuilding.com and my own website, JimStoppani.com, 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 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 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
9.0
4,372 Ratings
Verified Buyer Rating
9.0
3,846 Ratings
Average Flavor Rating
9.0
8 Flavors
Top Rated Flavor
8.5
Cherry Limeade
By clicking the button above, you agree to entering the Bodybuilding.com Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
5
Verified Buyer
  • 1 Cherry Limeade
  • 1 Orange Mango
9
Verified Buyer
  • 9 Black Cherry
  • 6 Natural Island Punch
  • 9 Cherry Limeade
  • 9 Strawberry Kiwi

I’m only reviewing the flavors I’ve tried since the 2.0/ legacy launch. The original 1.0 jym pre gave me the worst burn and kept coming back up through out my workout no matter how slow I drank it. I eventually switched to another product, which didn’t give me the same pump but I didn’t have the heart burn. After the launch of 2.0 I tried it again and the pump was there but not the heart burn. This stuff helps me get through my work out just drink it slow and everyday or it may mess with you stomach

10
Verified Buyer
  • 9 Raspberry Lemonade
  • 9 Orange Mango
  • 10 Cherry Limeade
  • 9 Rainbow Sherbet
  • 9 Strawberry Kiwi

I absolutely love these pre-workouts. I've used numerous ones since I started lifting 10 years ago and Pre-jym wins hands down. Ive even ventured a time or two to try a couple my buddies liked but I always come back to Jym. I love that I don't have to have an empty stomach to feel it working. The taste is amazing. It makes an awesome and refreshing pick me up on long days or drag *** days, as i call em. PreJym for the WIN!!!

10
Verified Buyer
  • 9 Black Cherry
  • 10 Raspberry Lemonade
  • 1 Orange Mango

Best Pre Workout I’ve used. Been using for a year and have tried other pres in between. This one doesn’t make my heart feel like it’s gonna come outta my chest and gives me a excellent pump. 10 ⭐️ s

10
 
  • 10 Orange Mango
  • 10 Rainbow Sherbet
  • 10 Cherry Limeade
  • 10 Strawberry Kiwi

Hands DOWN BEST pre workout I've ever taken. I have more focus at the gym and for hours after the gym. The flavors are unmatched. I love the transparency of all the ingredients!

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

Have been using JYM supplement science products from day one. One true brand that uses premium ingredients and proper dosages. This Pre-Jym uses 13 prime key ingrediants needed for muscle building, strength, energy and endurance. It also is great for mental focus, thus can be used for daily energy drink too. Brand #1 100% recommend

10
Verified Buyer
  • 10 Black Cherry
  • 9 Refreshing Melon
  • 10 Orange Mango
  • 6 Natural Island Punch
  • 10 Cherry Limeade
  • 10 Rainbow Sherbet
  • 8 Strawberry Kiwi

I've been using Jym for over a year now and couldn't be happier with my results. The energy and focus I het when using this product is unmatched. The brand itself as a whole is changing the industry, so you can't go wrong when using these products

10
Verified Buyer
  • 10 Raspberry Lemonade
  • 10 Natural Island Punch
  • 10 Cherry Limeade

The only Pre workout I will use. It does not give you that "jacked up" feeling but gives you the stamina you need to push through an intense workout. I also use it as an energy drink during the day.

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

Tried them all and have been using Prejym as an energy drink to get me through the day and before my workouts. The legacy flavors are my favorite and I'm not exactly sure what I would do with my life without Rasberry Lemonade, it's beautiful! If you're wanting a high quality product with great flavor I highly recommend this! (Natural Island is more for the people who enjoy the bitter dropkick to their tastebuds)

1
 
  • 8 Raspberry Lemonade

Review: BCAA: found in all animal proteins and isolated BCAAs are less effective than whey protein or protein in general. Like ¼ as effective. Citruline Malate: pointless Creatine: proper dosage is 5mg/day. Also found in meat but supplementation is required for most people who need it. Also, unless you’re doing maximal exertion for less than 15s, it’s absolutely pointless. Beta alanine: useless Betaine: doesn’t actually work. In summation, don’t waste your money on preworkout. Especially this garbage.

10
 
  • 10 Rainbow Sherbet

I’ve been buying and using other (cheaper) preworkouts for the past few years. I just couldn’t bring myself to spend this much on a container! But then I did the math and realized I was spending much more on the “cheap” preworkout because the 2 scoop serving size wasn’t enough; the container recommended 4-6 scoops and that is what I did. Pre Jym’s scoop is HUGE and you for sure only need one scoop. I bought the rainbow sherbert flavor and it tastes exactly like it! I had great focus and absolutely no jitters, just long lasting energy. I can’t wait to try the other flavors! Don’t let the price turn you off. Compare the quality of ingredients, quantity of ingredients, and g per actual serving and you might be surprised to find out you’re actually spending more on your cheap PW!

10
Verified Buyer
  • 10 Raspberry Lemonade
  • 8 Orange Mango
  • 7 Strawberry Kiwi

This product is the best on the market. You don't feel all amped up but you will have great focus and long lasting energy. Honestly I'd rather have great focused long workout verses a amped up workout where you crash right after. Sip on this product 20 to 30 minutes before your workout and you'll have energy for at least four hours. I don't take this product if I'm working out late at night instead I'll take Post Matrix and then following the workout with Post Matrix and Past Carbs. After that drink my Pro and I'm set.

10
 
  • 10 Refreshing Melon
  • 10 Black Cherry
  • 10 Rainbow Sherbet

Prior to using this product line, I had no experience with any other supplement lines. I was a little sceptical of how much this product would live up to the hype. I was amazed at how much this Pre workout helped me with being able to hit my workouts with an unbelievable amount of intensity! The flavors are phenomenal! I haven't had one that I wasn't a fan of, but refreshing melon is my hands down favourite! When money was tight, I did try other cheaper brands and I will never do that again. For me, it's Jym or nothing!

10
 
  • 10 Refreshing Melon
  • 10 Cherry Limeade

Tried many systems but the Jym line is by far superior. The straight forward no hiding behind proprietary blends approach is refreshing and I couldn’t be happier with the results I have gotten. Do yourself a favor and invest in this brand and yourself.

10
 
  • 10 Black Cherry
  • 10 Cherry Limeade

I love the intensity of the product. I dont get jitters or feel blah after. The product is so complete dont have to buy extra products just to make up for it. It's all in here already the exact doses you need.

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
OTHER INGREDIENTS:
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.