JYM Supplement Science


24g of Pure, Quality Protein in Every Scoop with No Added Amino Acids or Filler Nutrients
A Pure Blend of High-Quality Proteins in Exact Amounts to Maximize Growth, Recovery, and Repair*
9.1 out of 10 (2,435 Reviews)
4 Sizes
907 Grams
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9 Flavors
Banana Cream Pie
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Price: $34.99 ($1.35 / Serving)
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Product Overview

Pro JYM. The anabolic protein powder created and used by Dr. Jim Stoppani. High Quality Protein Blend for Maximal Muscle Growth.

"JYM Supplement Science combines real science with best-in-class ingredients and precise doses to deliver unreal results. Pro JYM is my exclusive protein blend designed to help you build muscle, recover faster, and train stronger. Whether you want to boost strength, add size, or get shredded, Pro JYM is for you. It's a powerful blend of proteins that add up to pure muscle fuel."

Grow Like a Pro

Each scoop of Pro JYM delivers 24 grams of pure, quality protein. It’s not "spiked" with single amino acids to artificially increase the protein content or made with cheap and inferior whey protein concentrate or caseinates. To make Pro JYM, I selected only the highest quality whey protein isolate, micellar casein, milk protein isolate, and egg white protein (egg albumin).

The 24 grams of protein in each scoop of Pro JYM contain the following:• Whey protein isolate: 7.5g

  • Whey protein isolate: 7.5g
  • Micellar casein: 7g
  • Egg albumin: 2.5g
  • Milk protein isolate: 7g (5.5g casein, 1.5g whey)

Since milk protein isolate is 20 percent whey protein and 80 percent micellar casein, the 24 grams of protein in Pro JYM are really broken down into three main categories:

Protein chart
A Blend is Best

While a high-quality protein powder should be at the top of everyone's supplement shopping list, don't make the common mistake of buying a pure whey protein powder right off the bat. Yes, whey protein is a critical staple for muscle growth, but to truly maximize growth, you need more than just whey. You need a precise blend of performance proteins.

Whey is a very fast-digesting protein. The rapid rate of digestion is one of whey's benefits, but on its own, this quality can actually be a downfall. Because whey digests so fast, it quickly boosts muscle protein synthesis (MPS). However, it only boosts MPS for a short amount of time.

Research now shows that when you add medium-digesting and slow-digesting proteins to whey, muscle protein synthesis remains elevated for longer than when using whey alone. Since muscle protein synthesis leads to muscle growth, elevating muscle protein synthesis for longer can have a significant impact on your overall gains.

In fact, research suggests that people who add slow-digesting casein protein to a whey protein shake around their workouts enjoy greater muscle growth over time than people taking whey alone. This research is the very reason I recommend taking a blend of fast-digesting whey protein, medium-digesting egg protein, and slow-digesting micellar casein.

Say No to Protein Spiking!

Many supplement manufacturers cut corners on their protein powders because high-quality protein is very expensive to make. They often use a dirty trick called “nitrogen spiking.” Nitrogen spiking, also called “amino spiking” or “protein spiking,” is a way to manipulate the test used to measure the protein content of protein powders.

The current method used to assess the amount of protein in a protein powder involves measuring the nitrogen content, which is then converted into protein amount. Nitrogen is used because protein is made of amino acids strung together in a chain, much like a pearl necklace, and every amino acid contains nitrogen. If manufacturers add loose amino acids to a powder, they can fool the test and deliver less pure protein than their labels claim.

Many people think that extra amino acids in their protein powder are beneficial. The major problem, however, is that certain amino acids are not added to make the protein powder more effective. Instead, they're simply added for their nitrogen. Most single amino acids, such as taurine and glycine, are much cheaper than whey protein, casein protein, milk protein, or egg protein. Even highly beneficial amino acids like BCAAs and glutamine are cheaper than protein powder. So, by adding a bunch of cheaper amino acids to their protein powders, supplement companies can boost their nitrogen content, which technically means they boost the amount of protein per serving, at least according to the nitrogen test.

Because the added amino acids are not complete proteins, the protein content of a spiked protein powder is not truly what a nitrogen test claims it is. For example, a whey protein powder may claim to contain 20 grams of protein per scoop. However, if the manufacturer added 5 grams of glycine per serving, then you are only getting 15 grams of actual whey protein and 5 grams of glycine, which would read as 20 grams of protein per serving.

An even bigger problem arises when proteins are spiked with amino acids that aren't used as building blocks to form proteins in the body. Taurine is once such amino acid. Taurine helps with energy production, so you might first be excited to see a high quantity of it in your protein. However, if 5 grams of taurine has been added to your protein powder that claims to contain 20 grams of protein per serving, you are only getting 15 grams of real protein and 5 grams of taurine. So the extra taurine comes at the expense of total protein.

If your favorite protein powder lists BCAAs, glutamine, beta-alanine, betaine (trimethylglycine), or creatine, you might think it’s a great product because of the additional nutrients. Yes, your protein contains these performance nutrients, but you may be getting them at the expense of the protein, not in addition to the protein. All those ingredients are nitrogen-containing compounds that count towards the total protein amount listed on the label. You might be getting up to 10 grams less protein per serving than listed on the label.

The rampant use of nitrogen spiking is the main reason why I list the precise amount of each protein in every 24 gram serving of Pro JYM. Whey protein isolate makes up 7.5 grams, micellar casein makes up 7 grams, and milk protein isolate makes up 7 grams, and the remaining 2.5 grams comes from egg white protein (egg albumen). That totals 24 grams from complete proteins with no added amino acids or filler nutrients.

The Power of Pro

As with every other supplement in the JYM line, I want you to know the exact ingredients and doses in Pro JYM. I want you to see that it contains nothing but a pure blend of high-quality proteins in the exact amounts needed to maximize growth, recovery, and repair. In short, I want you to grow like a pro.

Prepare to experience the power of real science, real ingredients, and unreal results.

Hit the JYM!

Jim Stoppani, PhD
Owner, JYM Supplement Science

JYM Supplement Science

Ratings & Reviews

Overall Rating
2,435 Ratings
Verified Buyer Rating
2,215 Ratings
Average Flavor Rating
12 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.
Verified Buyer
  • 2 Tahitian Vanilla Bean

I see a lot of people complaining about the same thing I have experienced. I used the old vanilla flavor for several years. Recently, I bought a 4 lb. size of the "Tahitian vanilla bean", which replaces the old flavor. It is horrific in taste, compared to the original. It also doesn't mix well. Does anyone know the real reason for the change (not an opinion). I can only surmise this was due to the legal haggles Stoppini got into with BB, and was forced to change the formula to not conflict with contractual commitments. There is a clear trend of dramatic fall off in satisfaction from reviewers, other than the obvious plants that have placed disingenuous reviews in an attempt to offset.

Verified Buyer
  • 2 S'mores

They changed up the formula. It tastes bad and doesn't mix well anymore. Unfortunately, I'm stuck with a 4lb tub. Hopefully they switch it back. I'm not sure why they would mess with a good thing.

Verified Buyer
  • 1 Chocolate Cookie Crunch

The advertising of the 2.0 being the same as the legacy is a joke. New Cookie Crunch tastes nothing like original. Tastes like every other chalky protein powder (although others are a lot cheaper). Will look elsewhere in the future.

Verified Buyer
  • 2 S'mores

S'mores used to be my favorite protein shake based on taste, I was disappointed when for the last couple of months it was unavailable online. When I saw it back jumped on it quick and picked up two 4 lbs containers however there has been a switch in formula and this new product is disgusting just like the several other products I've tried from the Pro JYM line. Switching proteins until the old formula is back. Amazing customer service at, they provided me with a full refund.

Verified Buyer
  • 10 S'mores

I ventured into other brands after seeing the negative reviews about JYM. they were all terrible in comparison! don't listen to these haters! the Smores is so good I look forward to drinking my protein shakes

Verified Buyer
  • 5 Tahitian Vanilla Bean

Tahitian vanilla bean does not mix well in a shaker. I am really disappointed that straight vanilla has been discontinued!

Verified Buyer
  • 9 Banana Cream Pie
  • 10 Chocolate Cookie Crunch
  • 1 S'mores

Its the blend you go for its an amazing formula with an extraordinary taste so calm on the stomach and especially for ppl thats have a sensitive one.

Verified Buyer
  • 6 Tahitian Vanilla Bean
  • 9 Cookies & Cream

Cookies and cream is disgustingly sweet, and the new vanilla flavor is terrible compared to the original. Hope you switch back to the original vanilla flavor. Switching proteins for now.

Verified Buyer
  • 6 S'mores

The NEW S'mores flavor is NOT as good as the OLD S'mores. This new S'mores taste almost as bad as the Chocolate Cookie Crunch. This new formula is not pleasing like the Old one.

Verified Buyer
  • 1 Cookies & Cream

It looks like Jim sold out which contradicts what made him popular to begin with. His changed formulas to a cheaper on and now his protein blend tastes like a$&. We trusted Jim because he took a different angle by not hiding ingredients. But now he’s has substituted quality for cost and padding his pockets

  • 10 Chocolate Cookie Crunch

OK, I bought 2.... 4lb jugs of Legacy on March 12 very skeptical, that it was original formula, got home opened Chocolate Cookie Crunch & couldn't believe it!!! Old formula it is!! Can't wait too try Cookies & Cream tommorw after my workout, let's get Smores back & forget 2.0 formula!!

  • 1 Chocolate Cookie Crunch

If i could rate this -10 i would like thousands before me asked or stated why would you change a flavor of the best tasting highest rated protein on the market. I can see two scenarios 1, He is a greedy ***** wanted to make more money with using crappy ingredients. 2, He is a stupid business man goes after his head thinking if he introduces a new flavor it will fly off the shelves not listening to his customer base. Bud if you want to run with crappy line of products go for it but at least bring back the old flavors for us so we can enjoy it or we will go elsewhere.

Verified Buyer
  • 10 S'mores

This is a review of the new legacy flavor of Smores. Its slightly better than the original which I thought was almost impossible. The marshmallows are slightly bigger and there is a nice hint of graham cracker in the powder. Jim really hit a homerun with this product, which is by far my favorite flavor. Great job!

  • 6 Mint Chocolate Chip
  • 8 Tahitian Vanilla Bean
  • 7 Chocolate Mousse

All his supp s at beginning was great He changed so he could ***** the consumer and save money using bs ingredients in order to save his money.

What's in JYM Supplement Science Pro JYM

Serving Size: 1 Scoop (35g)
Servings Per Container: About 26
Amount Per Serving % Daily Value
Calories 140       
Calories From Fat 25       
Total Fat 2.5 g 4%**
Saturated Fat 2.5 g 13%**
Cholesterol 15 mg 5%
Total Carbohydrates 4 g 1%**
Sugars 1 g
Protein 24 g 48%**
Calcium 412 mg 41%
Sodium 120 mg 5%
Potassium 115 mg 3%
** Percent Daily Values are based on a 2000-calorie diet.
† Daily value not established.
Protein Blend (Whey Protein Isolate, Micellar Casein, Milk Protein Isolate, Egg Protein), Coconut-Based Creamer (Coconut Oil, Maltodextrin, Food Starch, Mono- and Diglycerides, Tricalcium Phosphate), Natural And Artificial Flavors, Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan), Sucralose, Acesulfame Potassium, FD&C Yellow No. 5, Silicon Dioxide, Sunflower Lecithin.
ALLERGEN WARNING: Contains EGG and MILK. Produced on shared equipment that also processes products that contain SOY, TREE NUTS, and WHEAT ingredients.

Directions For Pro JYM: Mix each scoop of Pro JYM in 6-12 oz. of water or milk depending on your preference for thickness and texture. Consume 1-2 scoops within 30 minutes before workouts, and 1-2 scoops within 30 minutes after workouts. Also consider taking 1-2 scoops when you first wake up each day and before going to bed for maximizing lean muscle mass gains. You can also consume 1-2 scoops between regular meals.

Warnings: Do not use as a sole source of nutrition. Do not exceed the recommended daily dose. Keep out of reach of children. Check with a qualified healthcare professional before taking this product if you are pregnant, nursing a baby, under 18 years of age, or if you have any known or suspected medical condition(s) and/or are taking any prescription or OTC medication(s). Concerning California Residents: This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

* 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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