Xtreme Size Up
Xtreme Size Up

Xtreme Size Up

Whey Protein Powder Contributing To Muscle Growth
Protein, Creatine, Glutamine, Calories And Carbs To Support and Maintain Muscle Mass
8.6 out of 10  (32 Reviews)
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Our Price: $41.58 ($2.60 / Serving) In Stock

Product Overview

Xtreme Size Up

MET-Rx Xtreme Size Up features FOUR Hardcore Optimizer Blends to help you keep growing.* Each serving of Xtreme Size-Up contains:

  • 600 Calories
  • 60g Protein
  • Over 70g of Energizing Carbs
  • 3g Creatine
  • 3g Glutamine
  • No Fructose
  • No Aspartame

Hard-gainers and mass-monsters unite! Your days of trying to take down endless amounts of food per sitting just to put on weight or maintain your weight are over! It’s time to grow and put on some quality mass.* Notice how we said “quality”? This isn’t your throw the kitchen sink in it type product where you will put on weight—sloppy weight. This is a very well thought out profile to fit your needs.

While this product is not meant to be used to replace whole food meals, it can be used as a meal supplement to increase your calories. Size-Up gainer mixes quickly and goes down easy.

You want to get big and put on some serious size this off-season? Then get yourself some MET-Rx Xtreme Size Up today, because if you aren’t, your competition is!*

Use in conjunction with an intense daily exercise program and a balanced diet including an adequate caloric intake.


There is a difference between looking big and being strong. True strength takes dedication.

Ratings & Reviews

Out of 10
Xtreme Size Up Reviews
32 Total Ratings
Write a Review
Write a Review
    4.5 | 2 Ratings
    8.6 | 2 Flavors
  • 9.3
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.
Out of 10

No written review.

Out of 10

Besides the horrible taste, it 4 scoops is A LOT; they aren't small scoops, but more like medium-large scoops; I could only do 3 at a time before I threw it away.

  • 1Chocolate
Out of 10

Value: 6/10 Mixability: 8/10 Taste: 9/10 Pretty good overall. Make your own gainer though.

Out of 10

No written review.

Out of 10

Good shake, gets thick in just 12 oz, be sure to use more water.

Out of 10

I just logged this product. My favorite thing about Size Up was the macros in it. Hefty amount of calories/carbs/protein per serving which really helps to hit your nutrition goals for the day. I had one shake a day and made some awesome concoctions. You can add in anything that you can imagine. The shake was very thick, that was the only downside to it.

  • 7Chocolate
Out of 10

No written review.

  • 10Vanilla
† This price is the retail price for this product found at one or more retail websites in the last 30 days. The price may not include shipping cost, tax, sale or promotional prices, or discounts such as member pricing. Prices may change. Bodybuilding.com verifies this price every 30 days.
6 Lbs.
6 Lbs.
16 Servings | $2.60 Per Serving
Flavor Rating
In Stock
In Stock

What's in MET-Rx Xtreme Size Up

6 Lbs. Chocolate
Supplement Facts
Serving Size4Scoops(167g)
Servings Per ContainerAbout 16
Amount Per Serving % Daily Value
Calories 600
Calories From Fat 60
Total Fat 7g 11%**
Saturated Fat 4.5g 22%**
Cholesterol 60mg 20%
Total Carbohydrate 79g 26%**
Dietary Fiber 8g 31%**
Sugars 6g ***
Protein 60g 121%**
Vitamin A(50% As Beta Carotene) 4,500IU 90%
Vitamin C 60mg 100%
Vitamin D 240IU 60%
Vitamin E 45IU 150%
Vitamin K 40mcg 50%
Thiamin 0.9mg 64%
Riboflavin 1mg 60%
Niacin 21mg 105%
Vitamin B6 1.2mg 63%
Folic Acid 400mcg 100%
Vitamin B12 3mcg 51%
Biotin 180mcg 60%
Pantothenic Acid 4mg 40%
Calcium 1,105mg 111%
Iron 13mg 70%
Phosphorus 874mg 87%
Iodine 64mcg 43%
Magnesium 59mg 15%
Zinc 7mg 48%
Selenium 28mcg 40%
Copper 0.8mg 42%
Manganese 1.5mg 76%
Chromium 63mcg 53%
Molybdenum 60mcg 81%
Chloride 265mg 8%
Sodium 390mg 16%
Potassium 1,620mg 46%
Creatine Monohydrate 3,000mg(3.0 g) ***
L-Glutamine 3,000mg(3.0 g) ***
Typical Amino Acid Profile (Milligrams Per 167 G Serving*****)
Essential Amino Acids
Histidine 1,356mg
Isoleucine 2,734mg
Leucine 5,017mg
Lysine 4,248mg
Methionine 1,316mg
Phenylalanine 2,266mg
Threonine 2,592mg
Tryptophan**** 671mg
Valine 3,137mg
Nonessential Amino Acids
Alanine 1,935mg
Arginine 1,665mg
Aspartic Acid 4,250mg
Cysteine 628mg
Glutamic Acid 9,222mg
Glycine 950mg
Proline 4,351mg
Serine 2,684mg
Tyrosine 2,340mg
****L-Tryptophan Is Naturally Occurring, Not Added.
*****approximate Values
** Percent Daily Values are based on a 2,000 calorie diet
*** Daily Value not established
Complex Carb Optimizer Blend(Maltodextrin, Rice Bran, Oat Fiber), Metamyosyn® Muscle Mass Optimizer Blend (Whey Protein Concentrate, Milk Protein Concentrate, Calcium Sodium Caseinate, Creatine Monohydrate, L-Glutamine, Dried Egg White), Cocoa(Processed With Alkali), MultiVitamin Optimizer Blend(Di-Potassium Phosphate, Calcium Lactate, Di-Calcium Phosphate, Potassium Citrate, Potassium Chloride, Sodium Citrate, Tri-Calcium Phosphate, Ascorbic Acid, Dl-Alpha Tocopheryl Acetate, Ferrous Fumarate, Niacinamide, Zinc Oxide, D-Calcium Pantothenate, Copper Sulfate, Manganese Sulfate, Beta Carotene, Pyridoxine Hydrochloride, Thiamin Hydrochloride, Vitamin A Palmitate, Riboflavin, Folic Acid, Chromium Picolinate, Biotin, Sodium Molybdate, Potassium Iodide, Sodium Selenite, Phytonadione, Cholecalciferol, Cyanocobalamin), Natural And Artificial Flavors, Partially Hydrogenated Coconut Oil, Corn Syrup Solids, Lean Lipid Optimizer Blend(Medium Chain Triglycerides, Sunflower Oil, Flaxseed Powder), Cellulose Gum, Soy Lecithin, Xanthan Gum, Sodium Caseinate, Guar Gum, Carrageenan, Sucralose, Mono- AndDi-Glycerides, Salt, Gelatin, Acesulfame Potassium, Mannitol.
Contains Milk, Egg, Soy And Tree Nut (Walnut) Ingredients.

Directions For Xtreme Size Up: For adults, add 4 scoops (600 calories) (167g) to 16 oz of cold water and mix thoroughly in a blender or shaker. For increased calories, use 16 ounces of skim milk (772 total calories) or 2% milk (844 total calories) instead of water. Increase or decrease the amount of liquid to achieve desired consistency. Drink immediately for best results. As a reminder, discuss the supplements and medications you take with your health care providers.

Warnings: Do not exceed the recommended daily dose. Not intended for use by pregnant or nursing women. If you are taking any medications or planning any medical procedure, consult your doctor before use. Avoid this product if you have kidney disease. Discontinue use and consult your doctor if any adverse reactions occur. Not intended for use by persons under the age of 18. Food supplements should not be used as a substitute for a varied diet. KEEP OUT OF REACH OF CHILDREN. STORE AT ROOM TEMPERATURE AND AVOID EXCESSIVE HEAT. TAMPER RESISTANT: DO NOT USE IF SEAL UNDER CAP IS BROKEN OR MISSING.

* 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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