Mass JYM Mass Gainer Protein Powder
JYM Supplement Science

Mass JYM Mass Gainer Protein Powder

Build lean muscle and grow with this Mass Jym 1:1 ratio of Pro Jym protein and clean carbohydrates to help reach your goals.*
Mass Jym focuses on giving athletes the macros they need to build lean muscle in this weight gainer with 30g of protein, 30g carbohydrates, and 5g of quality fats per serving to meet your needs and achieve the physique you're looking for.*
8.1  out of 10  (40 Reviews)
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Product Overview


Mass JYM









Mass JYM is the first mass-gainer to use a non-proprietary protein blend (Pro JYM) along with a non-proprietary low-glycemic carbohydrate source, and a non-proprietary healthy fat source. Unlike like most mass-gainers that include twice as many carbs as protein, Mass JYM contains a 1:1 ratio of anabolic protein to low-GI carbs for “clean” gains.*

Whether you use it as a meal replacement on the go or as a mass gainer, rest assured that you’re getting quality ingredients and quality calories that, when combined with training and a proper whole food diet, will go toward packing on lean muscle mass, not excess body fat.*



It’s not enough to know just the total amount of protein, carbs and fat that a mass-gainer provides – you need to know the precise amounts of each type of protein, each type of carb, and each type of fat. Otherwise, you won’t know if it’s a lean-mass-builder or just another “fat-gainer” made of cheap protein concentrate and sugar. I essentially designed Mass JYM to be Pro JYM™ plus an equal amount of carbs – primarily low-glycemic and the perfect (and patent-pending) fat blend.

Each serving of Mass JYM provides:

  • 30g Protein (15 grams casein, 12 grams whey, 3 grams egg protein)
  • 30g Carbs (15 grams low-glycemic index (GI), 5 grams high-GI)
  • Nearly 4 grams of fat (1.3 grams saturated fat, 1.3 grams monounsaturated fat, 1.3 grams polyunsaturated fat, including 1 gram of CLA)


Designed to the exact specifications as my award winning Pro JYM protein – each serving of Mass JYM delivers 30 grams of the highest-quality protein powder blend available. Mass JYM delivers 50% casein from micellar casein and milk protein isolate; 40% whey protein from cold-filtered whey protein isolate and milk protein isolate; and 10% egg white protein.

This protein blend provides just enough fast-digesting whey to quickly spike muscle protein synthesis, plus adequate amounts of slow-digesting casein to keep protein synthesis elevated for several hours after ingestion. Egg white protein provides a medium-digesting protein source that also provides higher levels of sulfur-containing amino acids as compared to dairy protein.

Research studies show that a protein blend providing more slow-digesting casein than fast-acting whey and a medium-digesting protein elevates muscle protein synthesis longer and leads to greater net protein balance than whey protein alone. Simply put, a protein blend is more anabolic than whey on its own.



Each serving of Mass JYM contains 30 grams of carbohydrates to deliver a 1:1 ratio of protein to carbs. This is critical. Consume too many carbs, and you’ll gain body fat in addition to muscle. Take in too few carbs, and you won’t optimize muscle growth. The 1:1 ratio of protein to carbs helps keep the gains lean and steady.

Mass JYM’s ratio of low-glycemic (low-GI) to high-glycemic (high-GI) carbs is another key aspect that makes this formula a true lean-mass-gainer. I designed the carb blend in Mass JYM mainly from pea starch, isomaltulose, and oat fiber to deliver a 3:1 ratio of low-GI to high-GI carbs.

At this ratio, you won’t spike insulin (outside of a normal range) or add fat as easily as you would with a mass-gainer that uses primarily high-GI carbs like sugar, dextrose, or maltodextrin. It also means Mass JYM works well as a pre-workout carb source, as it provides a small amount of quick fuel followed by a larger amount of long-lasting fuel to help provide energy from the start of your workout all the way to the end. Research further shows that when consuming carbs before and/or during workouts, the body’s testosterone-to-cortisol ratio is higher, suggesting the body is in a more anabolic state.

Another way carbs are essential to maximizing muscle growth has to do with muscle cell volume. Glycogen, the storage form of carbohydrates in muscle, pulls water into muscle cells. The higher the muscle glycogen content, the fuller (bigger) the muscle will be. Yet maximal muscle cell volume has more to do than just looking bigger – it also places a stretch on the muscle cell membrane that can help signal biochemical pathways leading to an increase in muscle protein synthesis, which can lead to long-term increases in muscle growth.*



Fat is the most misunderstood macronutrient. It was deemed the devil for decades before real science stepped in and showed how essential most fats are. After protein, I consider fat the second most critical macronutrient, especially if gaining muscle mass and strength is important to you.

Dietary fat is quite anabolic when you consume the right amounts and types of it in the proper balance. Most commercial mass-gainers use vegetable fat sources comprised mainly of polyunsaturated fats. This is the last type of fat that a healthy male trying to maximize muscle growth should be pounding down. Ideally, you want to consume a diet that provides a 1:1:1 ratio of saturated to monounsaturated to polyunsaturated fats. But good luck trying to calculate your fat percentages in addition to eating the proper total amount of fat each day.

With Mass JYM, I took the guesswork out of it and designed a patent-pending fat blend/creamer that provides the aforementioned 1:1:1 ratio (saturated to monounsaturated to polyunsaturated fat), including 1 gram of conjugated linoleic acid (CLA) – a special type of omega-6 polyunsaturated fat that studies have indicated simultaneously helps build muscle and strength during periods of lower calorie intake.* CLA provides numerous other health benefits as well, yet most people don’t get adequate amounts of it in their diets.



Each scoop of Mass JYM provides not only the perfect amounts of all three macronutrients, but also the ideal ratio of macro types for each one. You’ll be hard-pressed to find a more ideal supplement for building lean muscle mass and strength than Mass JYM.

©2019 JYM Supplement Science. All rights reserved. JYM® and JYM Supplement Science® are registered trademarks of PHD Fitness, LLC.

Always consult with a qualified healthcare professional prior to beginning any diet or exercise program or taking any dietary supplement. The content on this website is for informational and educational purposes only and is not intended as medical advice or to replace a relationship with a qualified healthcare professional.

Ratings & Reviews

Mass JYM Mass Gainer Protein Powder
Overall Rating
40 Ratings
Verified Buyer Rating
31 Ratings
Average Flavor Rating
3 Flavors
Top Rated Flavor
Apple Fritter
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.
Jul 24, 2020
Verified Buyer
  • 7 Apple Fritter
Nov 13, 2019
Verified Buyer
  • 5 Apple Fritter

I have tried many many mass gainers and this definitely didn’t agree with me, had some internal pain using this near my kidney, stopped taking it and the pain went. There’s not enough calories either, I’m used to high calorie with creatine mass gainer. JYM’s pre work out and normal protein seems great, just a shame for the mass gainer had high hopes for this product based on there other supplements. Looking into the ingredients profile there are some questionable ingredients in there.

Oct 08, 2019
Verified Buyer
  • 10 Apple Fritter

Apple Fritter Yumm!

Oct 04, 2019
Verified Buyer
  • 5 Apple Fritter
  • 7 Chocolate Mousse
  • 10 Tahitian Vanilla Bean
May 15, 2019
Verified Buyer
  • 8 Tahitian Vanilla Bean

I’ve definitely seen improvements and growth. I often combine it with a post-workout powder so that really seems to improve both results and taste. Another satisfied Jym product

May 13, 2019
Verified Buyer

I’m trying this product for the first time trying to build. Good product overall but bad flavor and extremely thick.

May 06, 2019
Verified Buyer
  • 4 Tahitian Vanilla Bean

I was excited about this product and tried it for the first time found out it’s to thick. I was just galloping the entire drink. Doesn’t really have any taste to it. Ill be switching back to regular protein.

Apr 25, 2019
Verified Buyer
  • 9 Tahitian Vanilla Bean

I love TVB. Not only does it taste great on its own, you can mix it yo with PB2 powder, or throw in your favorite PostJym flavor and enjoy! Ive noticed increased strength gains since using MassJym too. Thanks Doc!

Apr 21, 2019
Verified Buyer
  • 2 Tahitian Vanilla Bean

I got the Tahitian Vanilla Bean and if you like the taste of paper lightly flavored with melted vanilla ice cream, you'll love this flavor. But, if you're like me, your biggest workout will be mentally as you struggle to choke it down and try to convince yourself you can down another gulp. I'll stick with the JYM protein from now on.

Mar 25, 2019

I been using JYM products for some time now and I am very happy with them , but unfortunately this one is not good at all , it will make you having constant heartburn and asidic. Do to some content in the I will stay with the regular JYM protein not this one ,sorry jym

Mar 02, 2019
  • 10 Tahitian Vanilla Bean

The Tahitian Vanilla bean taste like you let an entire bowl of premium Vanilla Bean Ice Cream completely melt, then drank it as a shake. I love it. But that is exactly the taste and sensation (consistency) of this shake.

Feb 02, 2019
Verified Buyer
  • 7 Chocolate Mousse
  • 5 Apple Fritter

Love the product. It does produce. But.... Dr. Jim pleaseeee give us a decent tasting straight chocolate and strawberry. I have to gulp it down because I don’t have exotic taste buds....

Nov 23, 2018
Verified Buyer
  • 9 Apple Fritter
  • 9 Tahitian Vanilla Bean

I was skeptical about trying these at first. Since I began using mass jym after my workouts I have definitely made more progress in muscle building as well as fat loss. Jim's protein flavors are outstanding. This is thicker and uses a bigger scoop than most protein shakes, you will need more water. Great product.

Nov 14, 2018
Verified Buyer
  • 4 Tahitian Vanilla Bean

There has been a very obvious formula change, unfortunately for the worse. The Vanilla flavor was awesome, not very thick or foamy. The Tahitian Vanilla Bean is bad, super thick, foamy for a while after first mixing. Old formula also did not contain maltodextrin, which Jim himself says is no good (super high glycemic index, poor quality), but the new Mass JYM now contains it. Bring back the old formula!

Oct 26, 2018
Verified Buyer
  • 1 Chocolate Mousse

The taste of the chocolate mousse is not good. I’m a big fan of the Pro Jym chocolate mousse, but not this one.

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Tahitian Vanilla Bean
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Price: $63.97  ($2.06 / Serving)
Flavor Rating: 7.2


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Mass Jym focuses on giving athletes the macros they need to build lean muscle in this weight gainer with 30g of protein, 30g carbohydrates, and 5g of quality fats per serving to meet your needs and achieve the physique you're looking for.*

What's in JYM Supplement Science Mass JYM Mass Gainer Protein Powder

5 Lbs. Tahitian Vanilla Bean
Serving Size: 1 scoop (74g)
Servings Per Container: About 30
Amount Per Serving % Daily Value*
Calories 280       
Sodium 360 mg 16%
Total Fat 3.5 g 4%**
Saturated Fat 1 g 5%**
Polyunsaturated Fat 1 g
Monounsaturated Fat 1 g
Cholesterol 20 mg 7%
Total Carbohydrate 32 g 12%**
Dietary Fiber 3 g 11%**
Total Sugars 10 g
Includes 7g Added Sugars 14%**
Protein 30 g 60%**
Calcium 460 mg 35%
Potassium 140 mg 3%
** 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.
Protein Blend (Whey Protein Isolate, Micellar Casein, Milk Protein Isolate, Egg White Protein), Pea Starch, Dextrose, Natural and Artificial Flavor, Polydextrose, Sunflower-Based Creamer (Sunflower Oil, Maltodextrin, Micellar Casein, Soy Lecithin, Sodium Citrate, Tricalcium Phosphate), isomaltulose, Conjugated Linoleic Acid (Conjugated Linoleic Acid Triglycerides, Corn Syrup Solids, Sodium Caseinate, Silicon Dioxide, Dipotassium Phosphate, Antioxidants), Coconut-Based Creamer (Coconut Oil, Maltodextrin, Food Starch, Mono- and Diglycerides, Tricalcium Phosphate), Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan), Salt, Oat Bran, Ground Vanilla Bean, Sunflower Lecithin, Sucralose, Acesulfame Potassium, Silicon Dioxide.
ALLERGEN WARNING: Contains EGG, MILK, and SOY. Produced on shared equipment that also processes products that contain TREE NUTS and WHEAT ingredients.

Directions For Mass JYM Mass Gainer Protein Powder: As a Dietary Supplement, mix one scoop of MASS JYM™ with 10-12oz. of cold water or milk depending on your preference for thickness and texture. Use MASS JYM at any time of day – morning, between meals, before bed, before or after workouts – as a meal supplement, to increase your total protein and caloric intake, and help maximize muscle mass gains.*

Warnings: Do not use as a sole source of nutrition. Do not use if you are pregnant, nursing, under the age of 18, or if you have, or suspect you have, any medical conditions and/or are taking any prescription or over the counter medication(s). Discontinue use two weeks prior to surgery.


* 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.