Optimum Nutrition Pro Complex Gainer

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Optimum Nutrition Pro Gainer will help you put on size, putting on size requires a balance of heavy training and quality nutrition. Because everyone’s a little different, some have a harder time packing on muscle than others. PRO Gainer is a high-protein formula delivering calories that count during recovery. Each shake provides ample amounts of 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 a high-protein meal between meals.

Optimum Nutrition Pro Gainer features:

  • 60g of protein per scoop
  • 650 Calories
  • Few Sugars
  • 7 Superior Proteins Including Whey, Casein, and Egg
  • High Protein to Carb Ratio
  • Mixes Effortlessly with a Blender, Shaker, or Spoon
  • Easy to Drink
  • Ideal for Stacking with Pro BCAA

Many athletes who are aiming to put on muscle size, tend to either have high metabolisms, weak appetites, or have on the run lifestyles, that make consuming sufficient calories through food alone, a challenge. Pro Complex Gainer provides 650 calories per serve, which adds plenty of clean calories to a hard-gainers diet.

Available Sizes:
Container Size: 2.3KG (5.08Lb)
Serving Size: 1 Heaping Scoop (165g)
Servings Per container: 14

Container Size: 4.5KG (10Lb)
Serving Size: 1 Heaping Scoop (165g)
Servings Per container: 28



Dispatch of orders is occuring as per normal.  Please allow a little extra time for delievery due to possible disruptions in the Courier Post network.

All orders are Free Shipping Nationwide:

CourierPost Express – Tracking information will be emailed to you once your order has been collected from our warehouse.  

Collection 4 times a day, final pick each day at 3.45pm Monday to Friday. We will process and pack your parcel within minutes of receiving your order.

Estimated Delivery Times:

Auckland – Overnight (However many Auckland orders will be delivered the same day depending on what time the order is placed)

North Island - Overnight

South Island – Overnight (for larger parcels allow 2 business days)
*Express South Island overnight delivery service available during check out.  These orders are transported by air rather than Courier Post trucks.

Rural - +1 business day from the above times

CourierPost does not operate on weekends or public holidays. 

Click here to view the full Shipping Details and Returns Policy.


Optimum Nutrition Pro Gainer Reviews

4.75/5 based on 11 customer reviews

Overall Rating

9.5 /10

11 Ratings

Average Flavour Rating

9.6 /10

3 Flavours

Top Rated Flavour

10 /10

Banana Cream

  • 4.5/5
    It’s very Helpful to gain muscle mass.
  • 5/5

    10/10 Double Chocolate

    Great product, mixes and tastes great. Good gainer to use for putting on clean mass
  • 5/5

    10/10 Double Chocolate

    Really liked this flavour and have already started to see results from taking this supplement in just 2 weeks. I am naturally quite skinny and I have found this to be an easy way to exceed my necessary calorie intake. I will be ordering this again when I run out, would recommend getting the larger size as the 2.5kg only has around 15 servings.
  • 4/5

    8/10 Vanilla

    It is a good gainer. Has helped me gain 2 kgs of good mass in couple of months. I like the flavors as well. It is not for endomorphs as has got a lot of calories... I am discontinuing it because it think this may be the reason for my recent teeth sensitivity...I am going back to my favorite pro complex.
  • 5/5

    10/10 Banana Cream

    1st time buying this gainer (I usually get the gold one,but i need something with more protein & GAINZ) and already the flavour Banana Cream is my new fave shake of all time and just within the week the Gains are coming through. Also you will want to buy the big size cause it's pretty filling, tasteful & affordable!!
  • 5/5

    10/10 Banana Cream

    Great gainer I have gone through two of these already banana cream as I love bananas or vanilla as it mixes with everything. Not as thick as other gainers and easy to consume! Mixes well does get bit clumpy but just chuck in the steel mixer thing that helps.
  • 4/5

    9/10 Vanilla

    10/10 Banana Cream

    I love On Nutrition Pro complex gainer. It is a right mix of protein and carbs, it will NOT put on extra fat and very good for lean muscle building. The bulking has been very gradual for me. 3 kg in 3 months and I take just one serving per day. Best part is how easily it mixes and the mild taste. Only down side is the cost. It is more expensive than other gainers.
  • 5/5
    I am taking this since almost 6 months + as I need to keep my intake high due to workload and workout. Perfect at 4am before going to milk the girls to replace a meal. Love the banana cream taste!
  • 5/5
    This is in my opinion the BEST gainer on the planet. It's the only gainer I will take. It's not full of sugary fillers it has real complex carbs as the base for most of it's calories. It really helps you pack the weight on and doesn't effect performance like other gainers. Also it tastes AMAZING.
  • 5/5
    Mixes well and testes very good and feels very light after consumption. Will recommend for gainers who wish to gain clean !! Very good product and very good price at Sprint ! Thanks guys

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