Pro Gainer By Optimum Nutrition

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Benefits and Results:

  • 60 Grams of Quality Proteins†
  • 85 Grams of Carbs Per Serving†
  • 650 Calories†
  • Few Sugars†
  • Increases Size and Strength†
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Pro Gainer By Optimum Nutrition - Weight Gainer

What is Pro Gainer?

PRO Gainer is a high-protein formula delivering calories that count during recovery.† Each shake provides ample supplemental protein, carbs, vitamins and minerals to build on the amount you're getting through a balanced diet of food. Use PRO Gainer as your post-workout recovery shake and/or high-protein meal between meals.

How does Pro Gainer work?

Key Ingredients:

  • Protein Blend (Whey protein isolate, When protein Concentrate, Calcium Caseinate, Egg Albumen, Hydrolyzed Whey Peptides, Glutamine Peptides)
  • Lipid Blend (Medium Chain Triglycerides, High Oleic Sunflower Oil)

Vitamins and Minerals:

  • Vitamin A, Vitamin C, Vitamin E, Vitamin B6, Vitamin B12, Calcium, Iron, Thiamin, Niacin, Folic Acid, Riboflavin, Biotin, Pantothenic Acid, Phosphorus, Iodine, Magnesium, Zinc, Selenium, Copper, Manganese, Chromium, Molybdenum, Chloride.

What can I expect from Pro Gainer?

The world’s premier "lean gainer" supplement. Unlike typical weight gain formulas, ON Pro Complex Gainer derives a much higher percentage of its calories from protein.

And, while some "ultra-hardgainers" require 1000, 1200, or even 1500 calorie/serving weight gain products, many athletes can gain quality mass with considerably less.

So, in addition to calories, ON Pro Complex Gainer provides a blend of 6 premium protein sources, complex carbohydrates, dietary fiber, lipids, digestive enzymes, vitamins and minerals.

Who should/ shouldn’t take it?

Pro Gainer is for anyone and everyone who wants to add on lean mass with a trustworthy supplement to do so.†


Do I use this before or after my work out?

  • It is recommended to use it after your workout.

I’m struggling to gain weight, can Pro Gainer help?

  • Pro Gainer can help add the missing calories you are missing to gain weight.

What flavors are currently available for this product?

  • Optimum is currently are offering Banana Cream, Vanilla Custard, and Double Chocolate.

Comparable Products:


If you are looking for a pre workout to add to your cycle so you can reach full potential during your workout†, we suggest taking: Gold Standard Pre Workout.

If you would like to add in a creatine to the mix to allow your body the best results during your workout and recovery†, we suggest taking: Optimum Creatine Monohydrate.

How do I take Pro Gainer?

Dosage and Directions:

Add 1 heaping scoop of PRO Gainer to 16 oz of cold water and shake until thoroughly dissolved.

TIP: Using milk will add additional calories, carbs and proteins to the nutrient profile of your gainer shake. You can also stack your shake with creatine and other size-supporting supplements.

Electric Blender: By using a electric blender, you can turn your gainer shake into a nutrient-dense mini-meal. Add in fresh or frozen fruit, peanut butter, nuts, seed and size-supporting supplements.

Tip: Adding a couple of ice cubes can improve the consistency of your shake.

What's In Pro Gainer?

Supplement Facts / Label:

Pro Gainer Supplement Facts

Warnings and Side Effects:

Allergen Information: Contains milk, egg, soy (lecithin), and wheat (glutamine peptides) ingredients. Keep out of reach of children. Diabetics and hypoglycemics should only use this under the advice of a qualified, licensed physician or dietician.


PLEASE NOTE: Product images represent the product offered but may not contain exact attributes. Please read the product description for the specific attributes of this product.

†PLEASE NOTE: The intention of the information above is for reference only. It is our goal to maintain and display accurate information. Yet, we can't guarantee it represents the latest formulation of the product. If you have any concerns, please visit the manufacturer's website. The information above is not a representation of our views at Same Day Supplements. These are the views and information provided by the product's manufacturer. The Food and Drug Administration has not evaluated these statements. The intention of this product is not to diagnose, treat, cure or prevent any disease or illness.

*Prices are subject to change at any time and items may limit to stock on hand.


  • Sumit Arora,Ashish M. Shendurse, Vivek Sharma, Balbir K. Wadhwa, and Ashish K. Singh(2011 May 5)Assessment of stability of binary sweetener blend (aspartame x acesulfame-K) during storage in whey lemon beverage
  • Yong Sun, Chang Hyun Byon, Youfeng Yang, Wayne E. Bradley, Louis J. Dell’Italia, Paul W. Sanders, Anupam Agarwal, Hui Wu, and Yabing Chen(2017 Oct 5)Dietary potassium regulates vascular calcification and arterial stiffness
In-stock orders placed before 3pm EST ship out the same day.

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Customer Reviews
  1. Nice
    Overall Product Review
    Fast shipping

    Review by Dennis

    Posted on

  2. ON
    Overall Product Review
    Pro Gainer is awesome. Definitely helped me gain weight. I didn't expect the scoop to be that big. I really enjoyed taking pro gainer. If you need to gain weight I recommend on taking this product.

    Review by Leon

    Posted on

  3. Pro Gainer
    Overall Product Review
    Pro Gainer has lead me to gain weight like no other gainer I have taken. The taste is ok. But I will continue to buy it.

    Review by Jacob

    Posted on

  4. It works
    Overall Product Review
    Tastes really good and lasts a long time

    Review by Adam

    Posted on

  5. Best out there
    Overall Product Review
    Hands down the best weight gainer I ever took. I bought the 10lb chocolate bag. I took it twice a day and the results came in fast. I gain 7lbs the first week. I actually look forward to taking it because the taste is great. It reminds me of a chocolate smoothie. 5 Stars!!!

    Review by Tyler

    Posted on

  6. Pro Gainer
    Overall Product Review
    I gain about 6lbs in two weeks. The strawberry flavor is good, but it is not the best. I didn't feel bloated taking it, which is always a plus. 4/5.

    Review by Nick

    Posted on

  7. Great Tasting Gainer
    Overall Product Review
    I really love this product. It mixes well in a shaker cup with no clumps. The taste is my favorite part about pro gainer. I bought the Vanilla flavor and I can't remember taking protein that tastes this good. Great Job ON!

    Review by Gabe

    Posted on

  8. High Quality Weight Gainer
    Overall Product Review
    Pro Gainer is the best weight gainer I ever took. The taste is incredible (chocolate). I gain around 16lbs when I was taking it, which is what I was looking to do. If you are having trouble gaining weight then pro gainer is for you.

    Review by Steve

    Posted on

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