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  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Whey Isolate by Rule 1
  • R1 Protein Isolate By Rule 1 Protein/wpi

Dispatched today if you order in the next few hours.

from 81 verified customers

4 sizes / 18 flavours

R1 Protein Whey Isolate by Rule 1

Price $109.95

$4.99 per serve 22 serves

Running low

Click & Collect Availability

  • 4 payments of $27.48*
  • 4 payments of $27.48*
  • From $18.32* a week
  • Rapidly delivers 25g of protein
  • Ultra-lean muscle building formula
  • Packed with muscle-building BCAAs
  • Gentle on sensitive stomachs

STACKS WELL WITH...

  • Supplement Mart Shaker $5.95
  • Crazed by Pharmageddon $69.95$79.95
  • Pump Juice by Transparent Supplements $79.95

Add $40.05 and shipping is free

  • Free gift when you spend $200
  • Free postage on orders over $150
  • East & west coast dispatch
  • Easy returns within 30 days

Remy Hughes - Supplement MartVerified expert

Msc Sports Nutrition, Bsc Exercise Science

Reviewed Jan 2026

I suggest R1 Protein Isolate to customers who want a premium, ultra-lean shake. Because it uses only whey isolate and hydrolysate, it digests incredibly fast and is much easier on the stomach for those with lactose sensitivities.

I love that it cuts out all the fillers and gums. It’s my top pick for strict dieters or anyone who wants a high-quality protein without unnecessary additives.

Good fit for

  • Muscle building
  • Fast recovery
  • Muscle recovery

Not for

  • Milk allergy
  • Vegan diets

About this product

This high-yield protein combines whey isolate and hydrolysate to deliver 25 grams of fast-absorbing protein per serve. It’s designed for athletes who want maximum muscle support without excess carbs, fats, or artificial fillers.

Ideal for those with sensitive digestion, the formula is free from gums and creamers. It mixes smoothly and provides a clean, reliable option for post-workout recovery.

  • Free standard shippingFREEOrders $150 and over, anywhere in Australia.
  • Standard$12.95Orders under $150. Tracked, from the warehouse closest to you.
  • Express$19.95Australia Post express network, any order value.
  • Express + Skip The Line$29.95Your order is picked and packed ahead of the queue, then sent express.
  • Click & collectFREEReady in 4 hours at any of our 58 stores. No minimum.
  • Australia Post parcel lockerSAME RATESHave it sent to a 24/7 parcel locker instead of your door and collect whenever suits. Choose a locker address at checkout; standard and express rates apply as above.
  • Shipping insurance$1.99Optional freight protection, added in the cart.
  • Eco bag$0.99A reusable Supplement Mart bag you can add to your order.
  • Heavy RTD levy$20Cartons of ready-to-drink only. The $150 free threshold still applies to the rest of the order.

Orders placed before 2PM AEST on a business day leave the same day. The rates above are what you will see at checkout.

Unopened and unused, send it back within 30 days for a refund or a swap. Change of mind included. Sealed tubs only, for obvious reasons.

Not sure which one is right for you? Ask us in chat, or walk into any of our 58 stores across Australia. Our staff train, so you get an answer rather than a sales pitch.

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NUTRITION & INGREDIENTS

Nutritional information panel

Based on the Chocolate Fudge flavour. Other flavours vary slightly.

Key ingredients

  • Protein Blend (WPI, Hydrolysed WPI)30.4g
  • Protein24.3g

Disclaimer: while we try our best to keep up-to-date nutritional information available on the website, packaging and products can change, therefore this information should serve only as a guide. Please refer to actual packaging for latest information.

BEST PAIRED WITH

  • This item R1 Protein Whey Isolate by Rule 1 $109.95
  • Supplement Mart Shaker $5.95
  • Crazed by Pharmageddon $69.95
  • Pump Juice by Transparent Supplements $79.95
4 items together $265.80

QUESTIONS

What makes R1 Isolate different from standard whey protein powders?

R1 Isolate is formulated using whey protein isolate as the primary—and often exclusive—protein source, which means the protein has undergone additional filtration compared to whey concentrate. This process removes most of the lactose, fats, and sugars while preserving the amino acid profile. The result is a cleaner protein powder that delivers a higher percentage of protein per serve, making it ideal for users who want lean protein support without unnecessary calories or fillers.

Is R1 Isolate suitable for people who are lactose sensitive?

R1 Isolate is generally well tolerated by individuals with mild lactose sensitivity due to its extremely low lactose content. During isolation, most milk sugars are filtered out, which significantly reduces digestive discomfort for many users. However, it is not completely lactose-free, so those with severe lactose intolerance should assess tolerance gradually or consult a healthcare professional before use.

How does R1 Isolate support muscle growth and recovery?

R1 Isolate delivers a complete amino acid profile, including naturally occurring branched-chain amino acids (BCAAs) such as leucine, isoleucine, and valine. Leucine plays a key role in stimulating muscle protein synthesis, while the fast digestion rate of whey isolate ensures amino acids reach the muscles quickly after training. This combination supports muscle repair, recovery, and lean mass development when paired with resistance training.

When is the best time to take R1 Isolate?

R1 Isolate is most commonly consumed post-workout due to its rapid digestion and fast amino acid delivery. It can also be used first thing in the morning to break an overnight fast or between meals to increase daily protein intake without adding excessive calories. Its low fat and carbohydrate content makes it particularly suitable when timing and macronutrient control are important.

Can R1 Isolate be used during a fat-loss or cutting phase?

Yes. R1 Isolate is frequently chosen during fat-loss phases because it provides high protein with minimal carbohydrates and fats. Protein helps preserve lean muscle mass while dieting and contributes to satiety, which may help control hunger. This makes R1 Isolate a practical option for athletes and everyday users aiming to maintain muscle while reducing overall calorie intake.

Does R1 Isolate contain added sugars or unnecessary fillers?

R1 Isolate is designed with a minimalist formulation philosophy. It contains no added sugars and avoids excessive fillers that dilute protein content. Sweetness is achieved using carefully selected low-calorie sweeteners, allowing the product to maintain taste without compromising its nutritional profile. This approach aligns with users who prioritize transparency and macronutrient accuracy.

How does R1 Isolate mix and taste compared to other isolates?

R1 Isolate is known for its fine texture and strong mixability, dissolving easily in water or milk with minimal clumping. The filtration process contributes to a lighter mouthfeel compared to thicker whey concentrates. Flavor profiles are engineered to remain smooth and clean, avoiding the overly creamy or artificial taste sometimes associated with high-protein powders.

Is R1 Isolate tested for quality and banned substances?

Rule 1 emphasizes manufacturing consistency and quality control across its product range. R1 Isolate is produced using rigorous testing protocols to ensure label accuracy and ingredient integrity. While not marketed as a medical or drug-tested product, it is manufactured to meet strict quality standards that appeal to competitive athletes and informed consumers alike.

Can R1 Isolate be used for purposes other than shakes?

Absolutely. R1 Isolate can be incorporated into protein-rich recipes such as oats, smoothies, pancakes, or baked goods. Because of its neutral texture and low fat content, it blends well without significantly altering consistency. This versatility allows users to increase daily protein intake across multiple meals rather than relying solely on shakes.

Who is R1 Isolate best suited for?

R1 Isolate is ideal for individuals seeking a high-purity protein source with minimal calories, including athletes, gym-goers, and health-conscious consumers. It is particularly well suited to those focused on lean muscle development, body recomposition, or strict macronutrient tracking. Beginners and experienced users alike benefit from its simplicity, digestibility, and performance-focused formulation.

ACTIVE INGREDIENTS

  • Protein Blend (WPI, Hydrolysed WPI)30.4g
  • Protein24.3g

WHAT'S IN IT

R1 Isolate delivers fast-absorbing protein with a clean nutritional profile. Ideal for those prioritising lean muscle support.

  • Perfect if you want a lean protein
  • Helps you hit daily protein targets fast
  • Supports efficient muscle recovery and growth

ABOUT THIS PRODUCT

*** Clearance special - 2lb Strawberry Banana reduced! Expiry 11/26. Whilst stock lasts ***

Are you ready for one of the most popular protein powder drink mixes? Rule 1 R1 Protein Isolate is an absolute masterpiece: this high protein-yielding supplement contains 25g of protein, very low fat, 6g of BCAA’s, only 1g of carbs and NO fillers! It has been carefully designed to help you improve your physique and boost your performance to the absolute max. Know what you’re getting! Rule 1 R1 Protein Isolate will enhance your workout session and blow your mind at the same time. As one of the cleanest, highest yielding proteins on the market of WPI’s, it contains 0 gums, 0 creamers, 0 added sugars, 0 fat, 0 gluten (excludes cookies & cream), 0 fillers, 0 artificial preservatives and 0 amino or banned substance spiking!

  • With whey isolates & hydrolysates.
  • 25g protein per serving.
  • 87% of protein per serve.
  • 6g BCAA’s.
  • Low sugar and fat.
  • Super smooth mixability. 

Rule 1 R1 Protein Isolate is made of protein from 100% whey isolates and hydrolysates – absolutely no whey concentrates! These extraordinarily high-quality proteins are packed with muscle-building amino acids like leucine and are especially useful for higher-level athletes. Whey isolate is lower in fat and carbs than whey concentrate as it is further processed in such a way that much of the fat and carbs are removed. Furthermore, this type of protein is easier to digest for those with lactose sensitivities. Whey hydrolysate is digested the fastest, making it great for those with digestive problems or milk allergies. The best thing about hydrolyzed whey is its ability to break down fast and send amino acids to your muscles more rapidly than the other forms of whey, making it great for you when you have serious muscle-building goals!  If you’re looking for high-quality protein source capable of helping you meet total daily protein goals and maximizing your muscle growth, Rule 1 R1 Protein Isolate is for you! With just under 87% of protein and over 6g of BCAA’s per serve, Rule 1 WPI provides the ideal, most delicious shake of naturally occurring proteins combined with clinically proven muscle-building amino acids through added fortification. Include Rule 1 R1 Protein Isolate in your training routine and experience the ultimate workout session!

Nutritional Information

(Based on 38 serve Chocolate Fudge flavour)

Directions of Use

  • Tasty Shakes: Mix one heaping scoop of R1 Protein with approx. 240ml of water, milk, or your favorite beverage in a shaker cup or glass with spoon.
  • Smoothies: Add your favorite fruit and ice to the above, mix in blender and enjoy!
  • Quickie Breakfasts: Stir one scoop into oatmeal or yogurt for a fortified start.
  • Suggested Use: Consume 1-3 shakes (or equivalent) per day, based your personal protein requirements.
  • Best taken within 20 minutes after exercise, but can be taken any time of day.

CUSTOMER REVIEWS

4.9 / 5 from 81 reviews

I think this is the best-tasting protein ever
Nicholas O.Verified buyer

Tastiest protein on the market

Tastiest protein on the market. My absolute must have on ice with almond milk and a couple shots of coffee. My morning go-to
Kate D.Verified buyer
Such a great protein powder. Tastes good and mixes really easily
Dave M.Verified buyer
Salted caramel is the best. We use it every day for our a pre-workout protein coffee and also in yoghurt. We buy in bulk that's great!
Alison E.Verified buyer

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