5kg protein powder

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Protein powders are an essential part of any gym-goer’s diet. Not only do they help build muscle and aid in recovery after a workout, but they also provide vital nutrients that can help you reach your fitness goals. So, we’ve rounded up five of our best 5kg protein powders on the market today.

RRP: $54.95 - $289.95

5kg protein powder

Optimum Nutrition Serious Mass

RRP: $89.95 - $154.95

4kg protein powder

BSN Syntha-6

RRP: $89.95 - $239.95
RRP: $119.95 - $209.95

5kg protein powder

Rule 1 R1 Mass Gainer

RRP: $89.95 - $129.95

Our best 5kg protein powders

Optimum Nutrition Serious Mass (5.4kg)

If you’re serious about reaching your fitness goals, you’ll want to try Optimum Nutrition’s Serious Mass protein powder. This top-notch product is perfect for anyone who finds it difficult to gain weight but needs the extra calories to build lean muscle and size.

Whether you’re a bodybuilder bulking in the offseason or an athlete trying to add some mass, this 5kg of pure protein powder will give you just the boost you need. And don’t worry about force-feeding yourself – with Optimum Nutrition’s Serious Mass protein powder, all it takes is one delicious shake to reach your daily caloric goal.

Rule 1 Gain (5.18kg)

Combining good quality protein with a nutritional boost of carbohydrates, Rule 1 Gain is exactly what you need to take your training goals to the next level. Not only that, but it also serves as an excellent meal replacement choice with 530 calories per serving, along with plenty of protein and carbs for maximum nutritional benefit.

Whether you need an extra kick of calories on top of your regular food intake or a protein shake to replace your meal that is rich in branched-chain amino acids, Rule 1 Gain can help you achieve your goals in no time.

Optimum Nutrition Gold Standard 100% Whey  (4.5kg)

Optimum Nutrition is at the top of the game when it comes to producing high-quality protein powders, and they have sure made their mark with Gold Standard 100% Whey protein. Not only is this great-tasting, easy to mix and widely popular, but it also delivers what it promises: a steady, reliable source of high-quality whey protein for muscle protein synthesis.

With 18 flavours available, even the pickiest of eaters can find one that suits them – so you won’t be compromising your taste buds for good nutrition! This product has earned itself a legendary reputation, and rightly so. If you’re in the market for an unbeatable protein powder, look no further than Optimum Nutrition’s Gold Standard Whey.

Optimum Nutrition Gold Standard Gainer (4.67kg)

Optimum Nutrition Gold Standard Gainer has been designed with real food sources like oat, pea and potato so that it digests better. This complete dairy protein formula provides a balance of high-quality fast and slow-digesting proteins for optimum muscle growth, plus a carbohydrate blend to keep you feeling full for longer.

With medium-chain triglycerides, chia and flax added in, you can be sure that you’re taking in the nutrients your body needs without having any unpleasant aftertaste. So whether you’re looking for something to fill the gap before or after a workout or just as an extra calorie boost during peak performance times, ON Gold Standard Gainer has got your back.

BSN Syntha-6 (4.56kg)

BSN Syntha-6 is a must-have for serious athletes and fitness enthusiasts. It’s no surprise that this popular protein supplement has been around for such a long time – not only does it provide ultra-premium protein with 22g of protein per serve, but its delicious taste makes it an easy choice when supplementing your nutrition and exercise regime.

Regardless of your lifestyle, Syntha-6 ensures that you’re getting the essential protein needed for improved performance and bodybuilding goals. You really can’t go wrong with a scoop or two of BSN Syntha-6 – so what are you waiting for? Start supplementing to build that physique you’ve always dreamed of.

Other protein powder sizes we stock

In addition to the 5kg bulk protein powder sizes mentioned above, we also stock sizes of 1 kg to 4 kg for those looking for smaller amounts. Whether you’re looking for a big tub or a small scoop, we’ve got your nutritional needs covered here at PowerSupps.

Protein powder flavours we stock

We have a huge range of different protein powder flavours available to choose from.

Shop protein powder by diet

Have specific dietary requirements? Not a problem, check out our different ranges below.


What is the difference between whey protein isolate and whey protein concentrate?

Whey protein isolate is a fast-digesting form of whey protein that has been filtered to remove fat and lactose, making it one of the purest forms of whey protein available. Whey protein concentrate is a slightly less-refined version that typically contains a bit more fat and lactose but is still a great source of essential amino acids.

How much protein should I take daily?

As with any supplement, it’s important to speak to a healthcare professional before adding additional nutrients to your diet. However, as a general guideline, adults over 18 need about 0.8g of protein per kilogram of body weight each day to meet their daily protein intake. That would mean that someone who weighs 70kg would need at least 56g of protein daily.

How soon will I see results from taking a protein powder?

Results vary depending on individual fitness goals, but generally speaking, it can take anywhere from 2 to 3 weeks to start noticing the effects of a protein powder. However, it’s important to note that these results will only be sustained if proper nutrition and exercise are maintained in addition to taking the protein powder regularly.