System Stack 4 Lb. Pro
JYM Supplement Science

System Stack 4 Lb. Pro ,

Stack Your Results!
An Advanced Stack Designed To Enhance Workout Performance And Recovery!
9.5  out of 10  (42 Reviews)
Free Gift

Get a Free Pro JYM Protein Powder 2lb Chocolate Peanut Butter When You Spend $99 or More on JYM SUPPLEMENT SCIENCE Products!

*You must addPro JYM Protein Powder 2lb Chocolate Peanut Butter to your cart to get it for free.

Product Overview

  • 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 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 blunt muscle fatigue and keep you training stronger, longer.*
  • 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.*
  • 300 milligrams of Alpha-Glyceryl Phosphoryl Choline (50%) 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 the active ingredients in Pre JYM for even better results.*

Post JYM Active Matrix
  • Full doses of 8 science-backed ingredients
  • 6 grams of BCAAs in a 3:1:1 ratio that enhances muscle growth*
  • 3 grams of glutamine for better recovery and growth*
  • 2 grams of creatine HCL for greater strength, endurance, and muscle growth*
  • 2 grams of beta-alanine to boost muscle power, strength, endurance, and muscle growth*
  • 2 grams of Carnipure L-carnitine L-tartrate to aid recovery and put more testosterone to work for you*
  • 1.5 grams of betaine for greater power and strength during workouts*
  • 5 milligrams of BioPerine to enhance absorption of the active ingredients in Post JYM for even better results*

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 after workouts because it stimulates muscle protein synthesis (i.e., muscle growth) by activating the mTOR complex.*
  • It also increases insulin release, which drives more amino acids, creatine, and carnitine from Post JYM into your muscle cells.*
  • Having a 3:1:1 ratio of leucine to isoleucine to valine in a post-workout product, such as in Pre JYM, provides an extra bit of leucine for maximal muscle growth without compromising the critical role that isoleucine and valine play in this process.*

JYM Post JYM Carb
  • Research confirms that working out for as little as 30 minutes can deplete muscle glycogen levels by more than 40%. Intense workouts lasting 60-90 minutes would deplete muscle glycogen levels considerably more.
  • When carbs are consumed immediately postworkout, a supercompensation of muscle glycogen stores is possible. In fact, delaying carb consumption by just 2 hours has been suggested to reduce the rate of glycogen replenishment by 50%.
  • Another benefit of high-glcyemic carbs is the insulin spike that they deliver. A post-workout increase in insulin helps maximize the uptake of creatine and carnitine (included in Post JYM Active Ingredients Matrix) by the muscle cells.*
  • Dextrose is one of the fastest-digesting carbohydrates you can consume. It's essentially glucose (what blood sugar is) and therefore needs no digesting and is absorbed by the body almost immediately.*


The 24 grams of protein in each scoop of Pro JYM contain the following:

  • Whey Protein Isolate: 7.5g
  • Micellar Casein: 7g
  • Egg Albumin: 2.5g
  • Milk Protein Isolate: 7g (5.5g Casein, 1.5g Whey)

Ratings & Reviews

System Stack 4 Lb. Pro
Overall Rating
42 Ratings
Verified Buyer Rating
31 Ratings
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.
Sep 26, 2020
Verified Buyer

I know these products work but my review is only negative to how sweet everything is! It’s horrible only because of the disgusting artificial sweeteners in everything. I understand that the dextrose will be sweet but there’s added sucralose even in that! I won’t be buying it again and I may have to buy a different brand of plain flavor to mix with it to cut that fake sugar taste down.

Mar 08, 2020

Anyone writing a review should consider rating the RESULTS!

Sep 14, 2019
Verified Buyer

All great flavors. Great taste. Pre workout is insane. Post really helps recover. And the protein is the best I've ever had

Oct 09, 2018
Verified Buyer

Liked the product. I bought the stack when they included the shirt. Shirt ripped on first day of use. And the pre-jym they sent me only had 20 servings in a 30 serving canister. So I had 10 days of other product left over after running out of pre-jym. Product also has turned clumpy and gritty since 2.0 came out with a really strong aftertaste that lasts all day. Gets the job done still but not to the standards I would prefer for my go to stack.

Feb 23, 2018

obviously im a huge fan of the Jym stack but i dont drink my post workout carbs so the dex is useless for me. also the savings just doesnt really seem to be there. certainly not enough to make me buy the dex knowing i wont use it.

Nov 21, 2017

I need to know the exact weight for the whole package (for the one who bought it). Is it only 4LB or this quantity for 1 item because looking into package details, I found, it can not be ONLY 4LB. Thanks

Jun 24, 2017

The rating is on price only. Doesn't make sense. This 4lb stack is 135$ and the 2lb stack is 100$. Difference of 35$. A 2lb bottle of pro is 32$. So buying the 2lb stack and a separate 2lb pro is 3$ cheaper than buying the 4lb stack that have the same pre, post, and carb servings. Am I missing something or should the price of the 4lb stack be adjusted?

Apr 19, 2017
Verified Buyer

Is the best product out there. Been taking her for the past two years and I would never buy another product.

Apr 16, 2016
Verified Buyer

Simply the best products!

Mar 06, 2016
Verified Buyer

I tried this stack and was impressed with the results. It was expensive but I will buy again. Listing out the ingredients made the price worth it. Pro JYM mixes very thick but tastes okay.

Feb 29, 2016
Verified Buyer

I highly recommend this #Jym stack! It has been since 2008 since I've been to the gym, BUT I didn't forget the importance of supplements. That is why, when I got back into working out, I needed the best on them market for workout supplements. SO, needless to say, I went with the #Jym stack! ONLY the BEST! Blessings, Ryan T.

Feb 22, 2016
No written review.
Nov 16, 2015
Verified Buyer

Best stack I have ever purchased and used. Amazing Quality!

Oct 29, 2015
Verified Buyer

holy cow, let me tell you. I started his shortcut to size program along with starting to use these supps, on month 2 of 3 so far and its the best pump/recovery I have ever received.. my skin gets so tight during a workout and I have lasting energy for by 2 hour bouts.

Oct 20, 2015
No written review.
Directions for System Stack 4 Lb. Pro: Follow the directions on the products' label.
Warnings: Read the warnings on the products' label.
* 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.
Check out other Performance Products.