The 2022 guide to Whey Protein Isolate

by PaulaVargas 3690 views Supplements

The 2022 guide to Whey Protein Isolate

Thinking about the right protein for you? With so many types to choose from, it can get confusing fast. One particular type of protein that gains a considerable about of popularity is Whey Protein Isolate. You may have seem some of your favourite athletes talking about the benefits, seen some tubs in store and wondering what the difference is with other protein. When it comes to choosing your post-workout powder, there are key differences between an isolate and proteins such as casein or whey protein concentrate. Here, we cover the top questions asked!

What is a Whey Protein Isolate (WPI)?

A WPI is the most fast-acting protein of the milk-based proteins. As such, many people love to have it straight after their training, to refuel the muscles as quickly as possible. Due to a double microfiltration process, it contains almost no fat or carbohydrates, and thus is extremely high in protein. In terms of texture and consistency, it tends to be more watery than the others, so if you prefer a thicker blend, you may go for a different choice (you can also add less water or milk!). If you have sensitivities to lactose but you still want the benefits of a milk-based protein, then a WPI will be your best bet as it's generally kindest to the gut.

What is the difference between a WPI and Whey Protein Blends?

Milk-based proteins are considered high quality as they contain all the necessary amino acids for muscle repair and recovery. A lot of the proteins you’ll see are a Whey Protein Blend, so they contain at least two types of milk-based protein. These blends are based from Whey Protein Concentrate (WPC), a medium digesting protein that is microfiltered once, in addition to other proteins. For example, the Gold Standard 100% Whey by Optimum Nutrition is a very popular choice amongst gym-goers, containing WPI, WPC, and whey peptides.  

Top benefits of using a WPI:

  • Helps you preserve and gain lean muscle tissue, of course!
  • Fast absorption, perfect for post-workout
  • Easier to digest than other proteins, perfect if you feel like you get bloated from regular protein blends
  • Extremely lean in terms of carbohydrates and fats - you will find the lowest amount of sugars and fats here and the highest amount of protein. Excellent if you're looking to maximise your protein levels whilst keeping the other macronutrients down.
  • Useful for both weight gain and weight loss, depending on the rest of your food intake
  • It is lowest in lactose so if you are sensitive to most dairy but still want the solid amino acid profile it provides, a WPI can help you. However, to err on the side of caution, you may want to opt for a plant protein instead.

When should you take your WPI?

Though you can enjoy it as a shake any time of the day, due to its fast-acting nature, it makes a perfect post-workout, when your muscles are crying out for nutrition!

Can a WPI make you gain fat?

Any protein will only make you gain fat if your overall daily calorie intake is more than what you need. 

Can you have whey protein isolate without doing exercise?

A quality WPI can help you preserve muscle mass during times of inactivity. However, for the best results, we highly recommend you engage in a weight training program that allows for muscle growth.

Can you have a WPI in water?

Of course! The consistencey is a little more watery than other proteins, so if you feel like it's too thin with just water, feel free to add in your favourite milk for a creamier texture.

Is a WPI suitable for lactose intolerant people?

WPIs contain almost zero lactose, and there are suitable for most people who are lactose intolerant. WPC and Casein contains a lot more lactose, and therefore, are not recommended for people with allergies or intolerances. If you want to be extra cautious, we recommend a natural protein instead. Though you will find some whey options there, most of the proteins are plant-based and collagen-based options.

What are the best Whey Protein Isolates in Australia?

If you're looking for the best-sellers in Whey Protein Isolate (WPI), then you're in the right place. These choices are customer-approved and tick the boxes in terms of high protein, delicious taste and excellent consistency.

1. Lean WPI by Genetix Nutrition  

Lean WPI by Genetix Nutrition

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Lean WPI is one of the best sellers for it's value factor, high protein content and easy digestibility. If you love whey protein but your stomach doesn't handle traditional whey protein blends, this one's for you. With 90% pure WPI, ultra filtration and dried at cold temperatures to preserve max nutrition, you can't go wrong with this bodybuilding staple.

Lean WPI gives you:  

  • 35.7g Protein
  • 0.7g Fat
  • 2.1g Carbohydrates
  • BCAAs and EAAs

2. R1 Protein WPI by Rule 1 Proteins

Firstly, R1 brings you an amazing selection of different flavours - check out some of these: Red Velvet, Apple Cinnamon, Strawberries & Cream and Fruity Cereal. 

Secondly, R1 has been a popular player for several years, well known for their high-quality manufacturing. Everyone wants to call themselves 'high quality' nowadays, but these guys really know what they're talking about. In each tub, you'll find a short list of ingredients - this is great, why? Because there's no fillers or other unnecessary ingredients.

Super-lean, mouth-watering flavours and with an optimal amino acid profile, you can't go past R1.

R1 Protien WPI gives you:  

  • 25g Protein
  • 0g Fat
  • 1g Carb
  • 6g BCAA’s

R1 Protein WPI by Rule 1 Proteins 

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3. ISO 100 WPI by Dymatize  

ISO 100 WPI by Dymatize

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When you think of 'clean' protein, think of Dymatize. ISO 100 is usually a favourite amongst serious gym goals and industry professionals, why? Because it stands the test of time in terms of quality, and this is exactly why I've featured it here. Dymatize is straight to the point, no fuss, no muss. Banned substance tested, you'll feel confident using this premium protein anywhere, anytime. 

ISO 100 WPI gives you:  

  • 25g Protein
  • 0g Fat
  • 0g Carbohydrates
  • 2.7g Leucine

4: IsoPept Zero by EHP Labs

If you've been to any fitness expos, you've probably seen EHP Labs bringing the hype factor. These guys aren't just all talk though - IsoPept Zero is a WPI that delivers a superior taste profile with NO sugar! The expert developers at EHP know a thing or two about supps - they've been in the game long enough to know not only what works, but what will appeal to a mass audience. Each product is scientifically developed with your highest fitness goals in mind - find hydrolyzed WPI fractions and whey protein isolate in an easy to drink formula that you'll look forward to every single day.

IsoPept Zero gives you:  

  • 25g Protein
  • 0.5g Fat
  • 2g Carb
  • 0g Sugar
  • 5.7g BCAA’s

IsoPept Zero by EHP Labs

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5:  Gold Standard 100% Isolate by Optimum Nutrition

Gold Standard 100% Isolate by Optimum Nutrition

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If you haven't heard of ON, then you've probably been living under a rock! With a huge global presence, you can count on a product that is loved by fitness enthusiasts, bodybuilders and athletes worldwide. Though they are more commonly known for their whey protein blend, Gold Standard 100% Whey, this isolate is ideal for you if you want a lighter, more easily digested option. If lean gains is your goal, then every macro counts - with almost no fat and only 106 calories per serve, you can easily fit this into any diet plan!

Gold Standard 100% Isolate gives you:  

  • 25g Protein
  • 0g Fat
  • 1g Carbohydrates
  • Low Sodium content


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  • Bachelor of Laws & Bachelor of Business (Marketing Major)
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  • Cert III & IV in Fitness
  • Others: EFT (Emotional Freedom Technique), Human Behavioural studies, Small Business Management

I train 5-6 x per week with a mix of weights & cardio and promote eating in moderation.
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