Out of 10
Read 25 Reviews
Out of 10
Read 25 Reviews

RTD 51

Protein Plus!
High Protein Ready-To-Drink Shake!
Supported Goal: Build Muscle
Main Ingredient: Whey Protein
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Product Overview


So you’re looking to get big, eh? Looking to put on some real quality size? Really? How are you going to do that with those tiny protein shakes you’re drinking with minimal amounts of protein? Did you steal them from your girlfriend? Put down the girly shake and come with us. We’re going to take you into a world where only the most muscular and fit individuals come when they’re looking for a ready-to-drink protein shake. This is the world of MET-Rx®.

With 51g of protein including MET-Rx’s exclusive Metamyosyn® protein blend, you get all the protein your muscles need to recover, repair, and grow along with essential vitamins and minerals —everything you need and have been looking for.*

Each flavor contains limited carbohydrates, fats and sugars as part of the total calorie count to help you build the body you’ve always dreamed. So quit cutting your goals short with those protein shakes of the past, and grab yourself a high-performance protein powerhouse. MET-Rx® RTD51, it’s not your girlfriend’s protein shake!

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
RTD 51 Reviews
25 Total Ratings
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    9.0 | 4 Ratings
    9.5 | 5 Flavors
  • 10
    Creamy Vanilla
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Out of 10

I used this as a meal replacement when I can't get food, and when I do, I still sip it throughout the day. I've only tried the Vanilla, which I put in my coffee, and the Berry Blast. Both are great.

Out of 10

Seems like you can only get the Mocha Blast flavour on Canadian orders, which is a shame because I'd love to try the vanilla and berry blast flavours, but the mocha flavour is pretty great. Especially good in the mornings.

Out of 10

Being on the go and not having alot of time to mix up my shakes, i decided to pay alittle more for the price of convenience. The shake is complete with everything your body needs for the day or even a meal. The only problem i have with the shake is that it is very thick, almost like a half melted milkshake. With that said, it somewhat affects the taste of the product. I wish the shake was less thick but nonetheless, it is still a great product.

  • 8 Frosty Chocolate
Out of 10

I used this as a meal replacement when I can't get food, and when I do, I still sip it throughout the day. I've only tried the Vanilla, which I put in my coffee, and the Berry Blast. Both are great.

Out of 10

I can only speak about my experience with this product and its been very good as it has help with muscle support and growth. I have increased in muscle mass and size, I found it very easy to drink. I buy it by the case drinking two a day normally one when I get up and one before I go to bed. I do recommend this product to anyone interested in a quick and easy way to get your extra protein in it does taste GREAT!.

  • 10 Frosty Chocolate
Out of 10

I just bought this after my workout because I didn't have any whey on hand and peanut butter cup sounded delicious. Actually, the Reeses' on the front hooked me 'cause it looked delicious haha. Anyway, the macros are outstanding on this, it's a blend and not just whey, which is excellent. With that said, the Peanut Butter Cup flavor tasted like complete garbage. I honestly was very lucky I bought another flavor as well and drank that instead. I have to figure out how I'm going to drink the rest of this :/ Macros on this: Great! Peanut Butter Cup: I would avoid this, no matter how delicious it sounds.

  • 3 Peanut Butter Cup
Out of 10

I bought this after a work out because I didn't have time to eat. The "shake" was more of a pudding consistency and I had to squeeze it out of the metal can. It tasted good but I left a lot in the can because I couldn't get it to come out. I would not buy this again.

Out of 10

This i an awesome source of protein in a reasonable amount of calories. I either take one to the gym & drink bet. my weight sets & cardio, or use one to mix w/ my custom high protein shake when I get home. Amazon.com seems to have the best prices that I can find.

  • 10 Creamy Vanilla
  • 8 Berry Blast
12 - 15 Fl. Oz. Cans $37.00
12 Servings | $3.08 Per Serving
Flavor Taste Availability
Berry Blast 0.0 In Stock
Cookies & Creme 0.0 On Backorder
Creamy Vanilla 10 In Stock
Frosty Chocolate 9.7 In Stock
Peanut Butter Cup 8.8 In Stock

What's in MET-Rx RTD 51

12 - 15 Fl. Oz. Cans Berry Blast
Serving Size 1 Can
Servings Per Container12
Amount Per Serving
Calories 230       
Calories From Fat 10       
% Daily Value **
Total Fat 1.5 g 2%
Saturated Fat .5 g 3%
Trans Fat 0 g       
Cholesterol 30 mg 10%
Sodium 190 mg 8%
Potassium 380 mg 11%
Total Carbohydrate 3 g 1%
Dietary Fiber 2 g 8%
Sugars 2 g       
Protein 51 g 102%
Vitamin A 30%
Vitamin C 50%
Calcium 100%
Iron 8%
Vitamin D 40%
Vitamin E 40%
Vitamin K 25%
Thiamin 70%
Riboflavin 50%
Niacin 45%
Vitamin B-6 50%
Folic Acid 45%
Vitamin B-12 60%
Biotin 35%
Pantothenic Acid 50%
Phosphorus 45%
Iodine 25%
Magnesium 6%
Zinc 10%
Selenium 20%
Copper 10%
Manganese 40%
Chromium 25%
Molybdate 25%
** Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs:
Water, Metamyosyn® VPR Protein Blend (Calcium Caseinate, Milk Protein Concentrate, Whey Protein Concentrate), Natural Flavors, Cellulose Gel, Vitamin And Mineral Blend (Tricalcium Phosphate, Sodium Phosphate, Sodium Ascorbate, Sodium Citrate, Dl-Alpha Tocopheryl Acetate, Niacinamide, Vitamin A Palmitate, D-Calcium Pantothenate, Ferrous Sulfate, Phytonadione, Manganese Sulfate, Cholecalciferol, Zinc Oxide, Pyridoxine Hydrochloride, Thiamin Hydrochloride, Riboflavin, Copper Sulfate, Cyanocobalamin, Folic Acid, Biotin, Chromium Chloride, Sodium Molybdate, Potassium Iodide, Sodium Selenite), Di-Potassium Phosphate, Sucralose, Cellulose Gum, Sodium Hydroxide, Acesulfame Potassium, Carrageenan, FD&C Red #3.
Contains milk ingredients.

Directions For RTD 51: Drink one to three cans per day to support your daily high protein and calorie needs. To support musclebuilding, consume approximately 1 gram of protein per pound of body weight from all dietary sources per day.* For best results, drink 1 can of RTD 51 immediately following your workout to help support muscle recovery.*

Shake Gently
Serve Chilled
Refrigerate after opening

Contents under pressure; Open slowly to reduce potential splashing.

* 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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