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Best Whey Protein Isolate (WPI) in Australia
Whey protein isolate (WPI) is the leanest type of whey on our shelves, and the most popular type of protein powder with Supps247 customers. This page ranks the isolates that sell best in our stores and online, checks each one against its brand label, and points out where they differ: scoop size, sugar, extras like digestive enzymes, sweeteners and price per serve. We have also included one isolate-first blend for anyone shopping on a tighter budget. Updated October 2026.
Our top picks at a glance
| Pick | Best for | Protein per serve | Serve size | Sugars per serve | Value |
|---|---|---|---|---|---|
| R1 Protein WPI | Best overall | 25 g | 32 g | 0 g | $$ |
| Primabolics Iso-Ripped | Best with digestive enzymes | 25 g | 30 g | 1.1 g | $$ |
| Dymatize ISO100 Hydrolyzed | Best hydrolysed WPI | 25 g | 32 g | 1 g | $$$ |
| CBUM Itholate Protein | Best flavour range | 25 g | 31 to 36 g | 0 to 3 g | $$$ |
| Optimum Nutrition Gold Standard 100% Isolate | Best for low carb | 25 g | 31 g | 0 g | $$ |
| Optimum Nutrition Gold Standard 100% Whey | Best budget alternative (isolate-first blend) | 24 g | 31 g | 2 g | $ |
1. R1 Protein WPI: best overall
R1 is the clear leader in our WPI sales, and the label backs it up. The protein comes only from whey isolate and hydrolysed whey isolate, and Rule 1 says there is no whey concentrate, creamer, gum or added amino acids. The Chocolate Fudge panel shows 0 g of sugars and half a gram of fat per scoop. It also comes in an Unflavoured version, which is handy for cooking or mixing into oats.
- 25 g protein per 32 g scoop, with 3 g carbohydrate and 0.5 g fat (Chocolate Fudge)
- Whey protein isolate and hydrolysed whey protein isolate are the only protein sources
- Rule 1 lists more than 6 g of naturally occurring BCAAs per serve
- Rule 1 states it is Informed Choice certified and tested for banned substances
Worth knowing: Flavoured versions use sucralose and acesulfame potassium and contain soy lecithin. Buying the 5 lb or 10 lb tub brings the cost per serve down a long way compared with the 2 lb tub.
2. Primabolics Iso-Ripped: best with digestive enzymes
Iso-Ripped pairs instantised whey isolate with hydrolysed whey isolate and adds a 50 mg digestive enzyme blend that includes lactase. It is our second-best-selling isolate after R1. It has the highest protein share per scoop of the isolates here, at 25 g in a 30 g serve, and lists its full amino acid profile on the pack.
- 25 g protein per 30 g scoop (about 83% protein)
- 2.1 g carbohydrate, 1.1 g sugars and 0.8 g fat per serve
- 2,846 mg leucine per serve, within the 700 to 3,000 mg range ISSN suggests per dose
- Also contains sea moss (150 mg) and chromium picolinate (150 mcg) per serve, sweetened with stevia
Worth knowing: This is the V2 formula. Older V1 packs listed different extras, so read the panel on the pack you pick up. The label says it is not suitable for children under 15 or pregnant women.
3. Dymatize ISO100 Hydrolyzed: best hydrolysed WPI
ISO100 lists hydrolysed whey protein isolate as its first ingredient, followed by whey protein isolate, so part of the protein has already been broken into smaller pieces. Dymatize says it is filtered to remove excess lactose, carbs, fat and sugar, and the Gourmet Chocolate panel shows 1 g of sugar per scoop. It suits people who want a very lean, quick-mixing isolate and do not mind paying more.
- 25 g protein per 32 g scoop (Gourmet Chocolate)
- 2 g carbohydrate, 1 g sugars and 1 g fat per serve
- 5.5 g BCAAs including 2.6 g leucine per serve
- Dymatize says it is banned substance tested
Worth knowing: It is sweetened with sucralose and stevia and contains soy lecithin. It sits at the premium end on price per serve, and the 20-serve pack costs more per serve than the 3 lb and 5 lb tubs.
4. CBUM Itholate Protein: best flavour range
Itholate stands out for its flavour range, with options such as Cinnamon Crunch Cereal, Maple Waffle and Mint Chip Ice Cream. The protein comes from whey protein isolate, every flavour lists 25 g per scoop, and it carries Informed Protein certification, which tests whether protein content matches the label. Scoop sizes vary by flavour because of the add-ins.
- 25 g protein per scoop in every flavour
- Scoop sizes from 31 g to 36 g, so protein share ranges from about 69% to 81%
- 25 serves per 2 lb tub
- Informed Protein certified for label protein accuracy
Worth knowing: Some flavours add MCT oil powder, cookie pieces or marshmallows, which adds a little fat and sugar. Most flavours contain a gum blend (guar, acacia and xanthan) and sucralose, and it is one of the dearer isolates per serve.
5. Optimum Nutrition Gold Standard 100% Isolate: best for low carb
Gold Standard 100% Isolate has the lowest carbohydrate count of the isolates we checked, at 1 g per scoop with 0 g sugars on the Australian Chocolate Bliss panel. Optimum Nutrition filters the whey to isolate out excess fat, cholesterol and sugar, then hydrolyses a portion of it. It sells in smaller numbers than R1, but it is a strong option if you track carbs closely.
- 25 g protein per 31 g scoop (Chocolate Bliss, Australian label)
- 1 g carbohydrate, 0 g sugars and 0.5 g fat per serve
- Hydrolysed whey protein isolate and whey protein isolate
- 5.5 g BCAAs and 11.4 g essential amino acids per serve, according to Optimum Nutrition
- Optimum Nutrition says it is banned substance tested under the Informed Choice program
Worth knowing: Our range is limited to Chocolate Bliss and Rich Vanilla. It is sweetened with sucralose (955) and contains soy lecithin, and sodium is 190 mg per serve in the Chocolate Bliss panel.
View Optimum Nutrition Gold Standard 100% Isolate
6. Optimum Nutrition Gold Standard 100% Whey: best budget alternative (isolate-first blend)
This is not a pure isolate, and we have included it on purpose. Gold Standard 100% Whey lists whey protein isolate first, then whey concentrate and whey peptides, and it costs noticeably less per serve than any isolate on this page. If you tolerate dairy well and want most of the benefit of an isolate for less money, it is the sensible compromise.
- 24 g protein per 31 g scoop
- 4 g carbohydrate, 2 g sugars and 1 g fat per serve (Banana Cream, Australian label)
- 73 serves per 2.27 kg tub
- Optimum Nutrition says it is banned substance tested under the Informed Choice program
Worth knowing: Because it contains whey concentrate, it has more carbohydrate and sugar per serve than the isolates above. It contains soy lecithin and the sweeteners 950 and 955.
View Optimum Nutrition Gold Standard 100% Whey
How we chose
We started with units sold at Supps247 stores and online over the last six months, combined different sizes of the same product, and kept products whose labels list whey protein isolate as the protein source. Label facts were checked against brand websites and label panels in October 2026. Value tiers come from price per serve at the time of writing: $ is cheaper than most picks on this page, $$ is in the middle and $$$ is premium. Brands do not pay for placement.
How to choose a whey protein isolate
Check that it really is an isolate. Read the ingredient list, not the front of the tub. In a pure isolate the protein comes only from whey protein isolate and, sometimes, hydrolysed whey protein isolate. If whey protein concentrate appears, it is a blend. That is not a problem, but blends usually carry a little more carbohydrate and sugar per scoop and cost less. Our isolate vs blend guide covers the trade-off in detail.
Work out the protein share. Divide protein per serve by scoop size. Iso-Ripped is about 83% protein (25 g in 30 g), Gold Standard 100% Isolate about 81%, and R1 and ISO100 about 78%. Flavours with add-ins, like some Itholate flavours, sit lower because the scoop is bigger for the same 25 g.
Hydrolysed or standard? Hydrolysed whey has been partly broken into smaller peptides. ISSN says rapidly digested proteins with plenty of essential amino acids and adequate leucine are the most effective at stimulating muscle protein synthesis, and that whey has an advantage over soy and casein in the short term. Any good isolate fits that description, so treat hydrolysis as a preference rather than a must. Browse hydrolysed whey if you want one.
Look at leucine. ISSN suggests 700 to 3,000 mg of leucine per dose. Iso-Ripped lists 2,846 mg and ISO100 2.6 g per scoop.
Lactose is lower, not zero. Brands filter isolates to remove more of the sugar, which includes lactose, but they are still dairy. Iso-Ripped adds lactase in its enzyme blend. If small amounts of dairy still bother you, look at our protein powder picks, which include a plant option.
Additives and testing. Check for gums, sweeteners and allergens such as soy. If you are drug tested in your sport, choose batch-tested products (for example HASTA or Informed Sport certified) and check with your sport before using any supplement. Compare every isolate we stock in the WPI collection.
FAQs
What is the difference between WPI and WPC?
Both are made from whey. Whey protein isolate (WPI) goes through more filtration, which Optimum Nutrition describes as isolating out excess fat, cholesterol and sugar, so more of each scoop is protein: about 81% for its Gold Standard 100% Isolate against about 77% for its Gold Standard 100% Whey blend. Whey protein concentrate (WPC) is less filtered and usually costs less. Many tubs blend the two.
Is hydrolysed whey isolate worth paying extra for?
For most people it is a preference, not a necessity. Hydrolysed whey is partly broken down into smaller peptides, and brands market it as faster digesting. ISSN points to fast-digesting proteins rich in essential amino acids and leucine as the most effective for muscle protein synthesis, and standard isolates already fit that description. Choose hydrolysed if you like how it mixes or sits.
Is WPI lactose free?
No. WPI is filtered to remove more of the sugar, which includes lactose, and Dymatize says ISO100 is filtered to remove excess lactose, but whey isolate is still a dairy product. Iso-Ripped also includes lactase in its digestive enzyme blend. If you have a diagnosed intolerance or allergy, talk to your doctor before choosing a dairy protein.
How much whey isolate should I have a day?
Use it to top up your total protein, not replace meals. ISSN suggests 1.4 to 2.0 g of protein per kg of body weight a day for people who exercise, and 20 to 40 g per serve. One scoop of any isolate here gives 25 g, so one or two scoops a day is plenty for most people, with the rest coming from food.
Can WPI help with weight loss?
No supplement can promise weight loss, because weight management depends on your overall diet and activity. What WPI can do is add protein with few extra kilojoules. ISSN notes that protein supplements are a practical way to get enough good-quality protein while keeping energy intake down. A scoop of isolate on this page is about 110 to 140 calories.
Do I need to drink WPI straight after training?
No. ISSN says the benefit of having protein right before or after training depends on the individual, and that spreading 20 to 40 g doses every 3 to 4 hours across the day is a sound approach. Have your shake whenever it fits your routine, whether that is after the gym, with breakfast or mid-afternoon.
Sources: ISSN position stand: protein and exercise (2017); Optimum Nutrition Australia: Gold Standard 100% Isolate; Dymatize: ISO100; Rule 1 Australia: R1 Protein; Primabolics: Iso-Ripped V2 label.
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 products in person 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.
