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Whey Protein Isolates

23 results

Products

  • Precision Isolate by Precision Nutrition

    45

    Precision Isolate by Precision Nutrition
    Whey Isolate

    3 sizes / 7 flavours

    Price$69.95$72.95

  • Whey Isolate by Legit

    4

    Whey Isolate by Legit
    Whey Isolate

    4 flavours available

    Price$119.95

  • IsoPept by EHP Labs CLEARANCE

    22

    IsoPept by EHP Labs
    Whey Isolate

    4 flavours available

    Price$99.00

  • R1 Protein Whey Isolate by Rule 1 CLEARANCE

    81

    R1 Protein Whey Isolate by Rule 1
    Whey Isolate

    4 sizes / 18 flavours

    Price$109.95

  • ISO100 by Dymatize

    24

    ISO100 by Dymatize
    Whey Isolate

    2 sizes / 13 flavours

    Price$104.95

  • Iso-Ripped V2 by Primabolics

    2

    Iso-Ripped V2 by Primabolics
    Thermogenic

    2 sizes / 8 flavours

    Price$119.95

  • Gold Standard 100% Isolate by Optimum Nutrition

    11

    Gold Standard 100% Isolate by Optimum Nutrition
    Whey Isolate

    3 sizes / 6 flavours

    Price$127.95

  • WPI 95 Switch by Switch Nutrition

    1

    WPI 95 Switch by Switch Nutrition
    Whey Isolate

    3 flavours available

    Price$129.95

  • Amino Charged WPI by International Protein

    15

    Amino Charged WPI by International Protein
    Whey Isolate

    3 sizes / 10 flavours

    Price$89.00

  • Protein 100% Whey Isolate by Muscle Nation

    212

    Protein 100% Whey Isolate by Muscle Nation
    Whey Isolate

    2 sizes / 12 flavours

    Price$39.99

  • R1 Naturally Flavoured Protein Whey Isolate by Rule 1

    6

    R1 Naturally Flavoured Protein Whey Isolate by Rule 1
    Whey Isolate

    2 sizes / 3 flavours

    Price$134.95

  • Hydro Pro WPI by Gen-Tec

    212

    Hydro Pro WPI by Gen-Tec
    Whey Isolate

    2 sizes / 3 flavours

    Price$139.95

  • IsoPro by Primabolics

    1

    IsoPro by Primabolics
    Whey Isolate

    2 flavours available

    Price$104.95

  • Whey Protein Isolate by Pillar Performance

    212

    Whey Protein Isolate by Pillar Performance
    Whey Isolate

    2 flavours available

    Price$134.95

  • Whey Isolate by Musashi

    212

    Whey Isolate by Musashi
    Whey Isolate

    2 flavours available

    Price$119.99$133.49

  • R1 Clear Whey Isolate by Rule 1

    212

    R1 Clear Whey Isolate by Rule 1
    Protein Water

    4 flavours available

    Price$119.95

  • Whey Protein Isolate Perform by Switch Perform

    212

    Whey Protein Isolate Perform by Switch Perform
    Whey Isolate

    2 flavours available

    Price$109.95

  • Monster WPI by Maxs

    212

    Monster WPI by Maxs
    Whey Isolate

    2 sizes / 4 flavours

    Price$104.95

  • Whey Clear Protein Isolate by Ghost

    212

    Whey Clear Protein Isolate by Ghost
    Protein Water

    4 flavours available

    Price$104.95

  • Beef Protein Isolate by Switch Nutrition

    212

    Beef Protein Isolate by Switch Nutrition
    Protein

    2 sizes / 2 flavours

    Price$59.95

  • Clean WPI by SBN

    2

    Clean WPI by SBN
    Whey Isolate

    3 flavours available

    Price$119.95$129.95

  • Clear Protein by Ryse

    212

    Clear Protein by Ryse
    Protein Water

    2 flavours available

    Price$89.95

What is whey protein isolate?

Whey protein isolate, usually shortened to WPI, is whey that has been filtered further than concentrate. The extra filtration strips out most of the fat and lactose, which lifts the protein content to roughly 90 per cent by weight against about 70 to 80 per cent for a concentrate. A standard 30 g scoop typically lands around 25 g of protein.

Two things follow from that filtration. It digests quickly and sits light, which is why it is the common pick straight after training or first thing in the morning. And with very little lactose left, people who find concentrate heavy on the stomach usually tolerate it better. The trade off is cost, since you are paying for the extra processing, and a thinner texture, because much of the flavour in a protein shake comes from the milk fat that isolate removes.

Why shop whey protein isolate at Supplement Mart?

  • 42 whey protein isolates in stock, across Australian and imported brands
  • 58 stores nationwide, with click and collect available
  • Free shipping Australia-wide on orders over $150, with no surcharges
  • East and west coast dispatch on orders placed before 2pm on weekdays
  • Supplement Mart Rewards, earning points on every dollar spent
  • An in-house nutritionist you can actually ask a question

How it is usually used

One scoop in 250 to 350 ml of cold water, shaken, after training or whenever protein is needed and food is not practical. Water keeps it fast and light; milk makes it creamier but adds back the lactose and fat that isolate was filtered to remove. Most people use one or two serves a day on top of meals rather than in place of them.

Which one suits your goal

The quickest way to narrow it down:

  • Lean goals and watching kilojoules: whey protein isolate is filtered further than concentrate - typically 90%+ protein by weight, with very little carbohydrate, fat or lactose left.
  • Everyday training and value: whey protein blends mix isolate with concentrate, which costs less per serve and usually tastes richer.
  • Dairy-free or vegan: vegan and plant protein is made from pea, rice, almond or a blend, with no lactose at all.
  • Overnight or between meals: casein protein digests slowly, releasing over hours rather than minutes.
  • Something lighter after cardio: protein water is clear isolate - it mixes thin and fruity instead of creamy, and is usually fat-free.

How to choose

  • Start with the type, not the brand. Every major brand makes a good concentrate and a good isolate; the type decides how it fits your day.
  • Check the protein per serve. Most whey and plant proteins land between 20 and 30 g. Read the nutrition panel rather than the front of the tub.
  • Compare the cost per serve. A larger tub is almost always cheaper per shake, so work out the price per serve before comparing two tubs on sticker price.
  • Account for lactose. Isolate is filtered lower in lactose than concentrate, and plant protein has none at all.
  • Pick a flavour you will finish. You will be drinking it most days. Most ranges sell a smaller size, which is the cheap way to find out whether you like it.

Popular right now

Looking for a proven place to start? These are the ones moving fastest in this range:

Brands in this range include Precision Nutrition, Legit, EHP Labs, Rule 1, Dymatize Nutrition, Primabolics, Optimum Nutrition and Switch Nutrition.

Shoppers browsing Whey Protein Isolates also look at 2025 Top Protein Powders, Muscle Growth & Strength, Protein Powders, Recovery & Repair, Clearance and Dymatize.

Frequently asked questions

What is the difference between WPI and WPC?

Filtration. Whey protein concentrate is around 70 to 80 per cent protein by weight and keeps more of the carbohydrate and fat from milk. Isolate is filtered further to roughly 90 per cent protein, with most of the lactose and fat removed. Concentrate tastes richer and costs less; isolate is leaner, lighter on the stomach and more expensive.

Is whey protein isolate suitable if I am lactose intolerant?

Usually, yes. The filtration that makes an isolate removes nearly all of the lactose, and most people with mild to moderate lactose intolerance handle it without trouble. It is not lactose free unless the label says so, and if you have a dairy allergy rather than lactose intolerance, a plant protein is the safer choice.

How much protein do I actually need?

The Australian Nutrient Reference Values set the recommended dietary intake at 0.84 g per kg of body weight per day for adult men and 0.75 g per kg for adult women. The International Society of Sports Nutrition suggests a higher range, 1.4 to 2.0 g per kg per day, for people doing regular resistance training. Both are linked under Sources below.

Should I mix it with water or milk?

Water if you want it fast, light and lowest in kilojoules, which is the usual choice after training. Milk if you want it thicker and more filling, which suits a breakfast or a between meals serve, at the cost of extra kilojoules and the lactose that was filtered out.

Does whey protein isolate help with fat loss?

Protein helps in a few indirect ways. It is more filling than carbohydrate or fat per kilojoule, and keeping protein high while in a deficit helps preserve muscle rather than losing it alongside fat. Isolate is useful here because it delivers protein with very little else attached. It does not burn fat on its own, and total daily intake is what matters.

Sources

Last reviewed: 10 October 2026