Whey Protein Isolate

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Whey protein isolate (WPI) is whey that has been filtered to remove most of the fat, carbohydrate and lactose, so it is usually around 90% protein by weight. Shop WPI from Rule 1, Dymatize ISO100, Optimum Nutrition, MuscleMeds, Next Generation, MuscleTech and more, including hydrolysed isolates.

Read the Whey Protein Isolate buying guide
  • R1 Protein WPI 10 lbs by Rule 1 Protein isolate RULE 1 Chocolate Fudge 10 LBS R1 Protein WPI 10 lbs by Rule 1 Protein isolate RULE 1 Vanilla Creme 10 LBS
    Rule 1

    R1 Protein WPI 10 lbs by Rule 1 Proteins

    4 flavours
    $419.95
  • Gold Standard 100% Isolate Whey Protein by Optimum Nutrition 5LB Protein isolate SUPPS247
    Optimum Nutrition

    Optimum Nutrition Gold Standard 100% Isolate Whey Protein 5 lbs

    2 flavours
    $264.95
  • Carnivor Protein by MuscleMeds 4.2LB PROTEIN SUPPS247 Chocolate Carnivor Protein by MuscleMeds 4.2LB PROTEIN SUPPS247 Cookies & Cream
    MuscleMeds

    MuscleMeds Carnivor Beef Protein Isolate

    2 sizes · 6 flavours
    From$129.95
  • Amino Charged WPI - By International Protein 3 Kg1.Amino Charged WPI - By International Protein 3 Kg1 Banana Ice Cream 3 kg
    International Protein

    Amino Charged WPI - By International Protein 3 Kg1

    8 flavours
    $361.95
  • Dymatize ISO100 Hydrolyzed 5LB Gourmet VanillaDymatize ISO100 Hydrolyzed 5LB Gourmet Chocolate
    Dymatize

    Dymatize ISO100 Hydrolyzed Whey Protein Isolate

    2 sizes · 9 flavours
    From$179.95$198.95
    Save $19
  • ISOPEPT HYDROLYZED WHEY PROTEIN by EHP PROTEIN SUPPS247 2lb Chocolate Decanade ISOPEPT HYDROLYZED WHEY PROTEIN by EHP PROTEIN SUPPS247 2lb Peanut Butter cups
    EHP Labs

    EHP Labs IsoPept Hydrolyzed Whey Protein Isolate 2 lb

    4 2lb tubs
    $114.95
  • Grass Fed WPI by Cyborg Sports.Grass Fed WPI by Cyborg Sports.
    Cyborg Sports

    Cyborg Sport Grass Fed WPI – 100% Whey Protein Isolate

    2 sizes · 7 flavours
    From$119.95
  • Iso-Ripped by Primabolics PROTEIN Primabolics Iso-Ripped by Primabolics PROTEIN Primabolics 4 Lbs Chocolate Hazelnut
    Primabolics

    Iso-Ripped by Primabolics

    2 sizes · 14 flavours
    From$119.95
  • Fat Burning Hydrolyzed Beef Protein PROTEIN SUPPS247 Fat Burning Hydrolyzed Beef Protein PROTEIN SUPPS247
    MuscleMeds

    MuscleMeds Carnivor Shred Hydrolyzed Beef Protein Isolate

    2 flavours
    $209.95
  • ON Gold Standard Whey Protein Isolate 10LB Protein isolate OPTIMUM NUTRITION 10 LB Cookies and Cream ON Gold Standard Whey Protein Isolate 10LB Protein isolate OPTIMUM NUTRITION 10 LB Double Rich Chocolate
    Optimum Nutrition

    Optimum Nutrition Gold Standard 100% Whey Protein 4.54kg (10lb)

    6 flavours
    $329.95
  • MuscleMeds Carnivor Mass Beef Protein Gainer – 25 Servings
    MuscleMeds

    MuscleMeds Carnivor Mass Beef Protein Gainer – 25 Servings

    2 flavours
    $279.95
  • ISO100 Hydrolyzed Protein by Dymatize PROTEIN DYMATIZE Gourmet Chocolate 23 Serves
    Dymatize

    Iso 100 20 Serves by Dymatize

    8 flavours
    $104.95
  • Amino Charged Protein Isolate By International Protein 1.25 kg PROTEIN SUPPS247 Amino Charged WPI by International Protein 1.25 kg Vanilla Ice Cream'
    International Protein

    Amino Charged WPI by International Protein 1.25 kg

    7 flavours
    $172
  • Complete 100% Whey by Welltech 5 lb PROTEIN SUPPS247 Chocolate Milkshake Welltech Nutrition Complete 100% Whey Grass-Fed 5LB PROTEIN SUPPS247 Chocolate Milkshake 5 LB
    Welltech Nutrition

    Complete Whey by Welltech Nutrition 5lbs

    4 flavours
    $124.95$129.95
    Save $5
  • Next Generation Protein Delicious 100% Whey Protein 2KG VanillaNext Generation Protein Delicious 100% Whey Protein 2KG Choc Coconut
    Next Generation

    Next Generation Protein Delicious 100% Whey Protein

    2 sizes · 5 flavours
    From$99.95$119.95
    Save $20
  • Grass fed Isolate 2 Lbs By Welltech Nutrition grass fed protein SUPPS247 Grass-Fed Isolate by Welltech Nutrition Protein isolate SUPPS247 Birthday Cake 2 LB
    Welltech Nutrition

    Welltech Nutrition Grass-Fed Isolate Whey Protein

    2 sizes · 5 flavours
    From$89.95
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Whey Protein Isolate: buying guide

Who is WPI for?

  • People who want the most protein per scoop with few extra calories.
  • Anyone who finds regular whey heavy on the stomach. Isolate is low in lactose, although not always lactose free, so check the label.
  • People in a cutting or calorie-controlled phase.

WPI, hydrolysed WPI or blend?

A hydrolysed isolate has been partly broken down, which some people find easier to digest; it usually costs a little more. A whey blend mixes isolate with concentrate and is often cheaper per serve. Read our comparison of WPI vs whey blend or browse whey blends.

How to compare WPI products

  • Protein per serve versus the scoop size in grams.
  • Price per serve across 2 lb, 5 lb and 10 lb tubs.
  • Added ingredients such as digestive enzymes, sweeteners or thickeners.
  • Flavour range. Many WPIs mix thinner than blends, so try them with milk if you like a thick shake.

Order online with Australia-wide delivery, free on orders of $100 or more, or visit a Supps247 store in Melbourne, regional Victoria or Brisbane to compare tubs in person and taste flavours before you buy. Members can use our price match guarantee on full-priced items.

Always read the label and follow the directions for use. If you have a medical condition, are pregnant or take regular medication, check with your doctor first.

Whey Protein Isolate: questions and answers

Is WPI lactose free?
Usually not completely. Isolate has much less lactose than whey concentrate, which suits many people with mild lactose sensitivity, but the exact amount varies by product. Check the label or choose a plant-based protein if you need to avoid dairy fully.
How many scoops of WPI should I have a day?
Most people use one or two scoops a day to top up the protein they get from food. Follow the serving size on the label and work out your total from your daily protein target.
Is WPI good for weight loss?
WPI is high in protein and low in fat and carbohydrate, which makes it easy to fit into a calorie-controlled diet. Weight loss still comes down to your overall diet and activity; protein powder is a convenient food, not a fat burner.
What is the difference between WPI and hydrolysed WPI?
Hydrolysed WPI has been partly pre-digested into smaller protein fragments. It is absorbed slightly faster and some people find it gentler on the stomach. Both deliver a similar amount of protein per serve.

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