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*
9.2 out of 10 (2,384 Reviews)
5 Sizes
2 Lbs - New
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1 Flavor
Red Velvet Cake
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Price: $34.99 ($1.40 / Serving)
Flavor Rating: 4.5
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Order and automatically receive 20% Off Pro JYM, 2 Lbs., Red Velvet Cake Only!

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
2,384 Ratings
Verified Buyer Rating
2,174 Ratings
Average Flavor Rating
11 Flavors
Top Rated Flavor
Chocolate Cookie Crunch
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
  • 3 Tahitian Vanilla Bean
  • 7 Chocolate Cookie Crunch

Used to love Pro Jym. Like many of the other reviews here, the new line is garbage. I literally went from a jar of the old Vanilla flavour (delicious and easy to mix) to the Tahitian Vanilla Bean and it was like night and day. Not only is the Tahitian Vanilla Bean tasteless (unless you consider chalk a taste), it mixes horribly as well. I once loyal Jym customer, I will be looking elsewhere for my protein powders.

Verified Buyer
  • 3 Chocolate Cookie Crunch

What happened to the old awesome flavor of Chocolate Cookie Crunch? This new flavor tastes nothing like the old delicious one! Truly disappointed in the change!

  • 6 Red Velvet Cake
  • 6 Mint Chocolate Chip
  • 6 Caramel Macchiato
  • 6 Chocolate Cookie Crunch
  • 8 Gingerbread Cookie - Limited Edition!
  • 2 Root Beer Float
  • 6 Chocolate Mousse

YOU RUINED CHOCOLATE COOKIE CRUNCH!!! High quality protein for sure, but the flavors are just garbage since moving to the 2.0 line. Bring back the clean creamer and dump the coconut creamer and make the protein less thick and bloating while instantly improving every flavor and the mixability. CHOCOLATE COOKIE CRUNCH WAS RUINED!!!! I can already tell that I'm going to be highly disappointed when S'mores comes out again. They were my 2 favorite flavors and they will be junk now.

Verified Buyer
  • 1 Chocolate Cookie Crunch

I use to LOVE Pro Jym’s Chocolate Cookie Crunch and would consistently buy it for years. Sadly that day has come to say good bye. The formula has changed and it taste yucky now. The artificial sugar taste is strong and the chocolate now taste bland/weak. We had a great run Jym. I chatted with bodybuilding customer svc and that rep agreed and said it was good before but doesn’t know why Jym changed his formula. I’ll be trying out Evlution Nutrition Stacked Protein that has 9.7 - 10 ratings on here.

Verified Buyer
  • 1 Chocolate Cookie Crunch

Used to absolutely love this protein (chocolate cookie crunch) because of the quality and delicious flavor. We were very disappointed when chocolate cookie crunch went out of stock and quickly bought it when it came back only to be sorely disappointed that the flavor had completely changed and it's disgusting now. Won't be buying more of this. S'mores is okay if you really want to use it.

  • 9 Tahitian Vanilla Bean

This was my first time using ProJym. I liked the vanilla as it had a very light, not overly sweet flavor. Was very slighly grainy in texture. Used it as shake and in baking. Baked in nicely.

Verified Buyer

I had been using ProJym for years, it was my staple every morning, post workout and bedtime. It WAS the best. None of these new reformulated versions are nearly as good. They have a completely artificial taste and they tear my GI tract to pieces. I’m devastated. I lived on the old version.

Verified Buyer
  • 8 Chocolate Cookie Crunch

I loved the old "legacy" version of the choc chip pro Jym, however, my last order I received the new version of the same flavour. It doesn't taste as good as the old legacy pro Jym.

  • 4 Tahitian Vanilla Bean
  • 3 Chocolate Cookie Crunch
  • 6 Gingerbread Cookie - Limited Edition!

I’m not sure what’s going on here, but let me point out a few things. - the flavors constantly change for some reason for the worst. - the vanilla bean and cookie crunch USED to be amazing. But they were both changed and are now straight up nasty. - Why is there constant drama with this company, just a few weeks ago he was telling people not to buy his product on this website. So weird. I’m not buying what Jim’s selling anymore.

Verified Buyer
  • 1 Chocolate Cookie Crunch
  • 10 Root Beer Float

I absolutely love Pro Jym and pre/post jym on a regular basis. The protein is top notch in quality and taste.......mostly. I was extremely excited when Chocolate Cookie Crunch was re-released. I just got my tub delivered today and I went straight to the kitchen and mixed up a scoop. As soon as I took my first sip, my excitement instantly became disappointment. It is NOTHING like the original flavor. This new "cookie crunch" is a LAZY replacement. Jun literally took the Chocolate Mousse flavor, threw in some cookie bits and slapped the cookie crunch label on it. It tastes EXACTLY like Chocolate Mousse. If I wanted Chocolate Mousse........I WOULD HAVE ORDERED CHOCOLATE MOUSSE.

Verified Buyer
  • 3 Red Velvet Cake
  • 7 Mint Chocolate Chip
  • 5 Banana Cream Pie
  • 7 Tahitian Vanilla Bean
  • 8 Caramel Macchiato
  • 7 Chocolate Mousse

The transparency in the Jym brand and the results that I have seen from using ProJym, it's hard to deviate after using the product for 3 years. I see all the reviews over the updated flavors being lack-luster, and I agree. The OG flavors were far superior to the new. However, the product is still a high quality protein blend that produces results when it comes down to it. I have been through my fair share of flavors, and I must say the new ones bearable. One thing that I have noticed is mixing the chocolate mousse and another flavor always seems to make it better. Just ordered the new cookie crunch, gingerbread cookie, and cookies & cream. Praying that when s'mores makes a come back, that it will taste the same if not better than the original. Because s'mores was the GOAT.

Verified Buyer
  • 4 Red Velvet Cake
  • 8 Mint Chocolate Chip
  • 6 Banana Cream Pie
  • 5 Tahitian Vanilla Bean
  • 5 Chocolate Cookie Crunch
  • 3 Chocolate Mousse

Like everyone else on here I was disappointed with the new Chocolate Cookie Crunch. It's not the same as the old one. It's also not as bad as everyone claims. It's not disgusting. It's still the best chocolate flavored protein out there but it doesn't compare to the old which I do understand the disappointment there because it was on it's own level. It's still a high quality protein just slightly disappointed that the old flavors aren't coming back.

Verified Buyer
  • 10 Chocolate Cookie Crunch

I recieved Chocolate cookie crunch as a gift but had to come give it a review. The flavor is outstanding and the little cookie pieces are a added bonus! I have made protein fudge and ice cream out of it as well already. It will be a must have on my supplement shelf for sure!

Verified Buyer
  • 1 Red Velvet Cake

Worst protein shake I’ve ever had taste like .... and upsets my stomach every time I use it I got the 50 servings and throw 30 servings away

Verified Buyer
  • 1 Chocolate Cookie Crunch

YOU BETRAYED US! YOU BETRAYED ME! Chocolate cookie crunch was the way, the truth, the Light! You completely destroyed the greatest protein that ever existed and in doing so totally eroded any trust we had left in your product. I will never buy your protein again you LIAR. I sold a tub of the old formula to a friend of mine who still had some remaining. He let me try a scoop to remember the good old days. It was incredible. Then I went home and tasted the garbage that YOU pushed on us. This heresy is unforgivable. I will be switching to BSN Syntha-6 Chocolate Peanut Butter, which is the true King now.

What's in JYM Supplement Science Pro JYM

Serving Size: 1 Scoop (36g)
Servings Per Container: About 25
Amount Per Serving % Daily Value
Calories 140       
Calories From Fat 25       
Total Fat 3 g 5%**
Saturated Fat 2.5 g 13%**
Cholesterol 15 mg 5%
Total Carbohydrates 5 g 2%**
Sugars 1 g
Protein 24 g 48%**
Calcium 413 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, Cocoa Processed With Alkali, FD&C Red No. 40, Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan), Sucralose, Acesulfame Potassium, 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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