100% Natural Soy Protein Isolate
Bulk Nutrients' Soy Protein Isolate has one of the highest nutritional values available. It's 100% GMO free and contains no cholesterol, saturated fats or sugar.
We deliberately source a soy protein that is not thick and gluggy. So it mixes easily and is great consumed with just water.
Soy Protein Isolate has a great amino acid spread and can be used for building muscle as well as losing weight, or simply substituted for a meal.
Product Description
Easy on the stomach
Vegetable proteins are gentler on the stomach than animal proteins so are suited to people with animal product allergies or sensitivities.
At Bulk Nutrients, we don't add anything to our Soy Protein Isolate that shouldn't be there. That means it's free from any additives, artificial flavourings or sweeteners and is 100% pure.
Suitable for vegetarians and vegans
Our plant-based proteins are flavoured with only completely natural ingredients. We use Monk Fruit and Stevia as a sweetener (of the highest grades available), which flavours the protein while adding no bitterness. What's more it's calorie free! Soy Protein is certified vegan by Vegan Australia.
For our natural flavours we use Natural Cocoa and Natural Chocolate flavouring for Chocolate and Natural Vanilla flavouring for Vanilla. Combined with Stevia and Thaumatin we have developed a great tasting natural product.
Directions / Ingredients
Directions
Soy Protein can be taken with water, juice, smoothies or milks. Generally one scoop is added to 300 - 500mls of liquid. It can also be added to food anytime to boost protein levels.
Serving Size
A typical dose is one flat scoop (30g).
Soy Protein Isolate Ingredients
Vanilla Flavour Soy Protein
Ingredients: Soy Protein Isolate, Natural Flavouring, Natural Sweetener (Stevia, Thaumatin), Xanthan Gum.
Contains: Soy
Chocolate Flavour Soy Protein
Ingredients: Soy Protein Isolate, Cocoa, Natural Flavouring, Natural Sweetener (Stevia, Thaumatin), Xanthan Gum.
Contains: Soy
Raw (Unflavoured) Soy Protein
Ingredients: Soy Protein Isolate.
Contains: Soy
Storage
Keep well sealed, store away from moisture, light and heat.
Further Reading
Vegan vs Omnivore Diet for Muscle Growth and Strength
Plant vs Animal Proteins: What’s the Difference?
The Best Sources of Plant Protein for Vegans
Everything You Need to Know About Plant-Based Diets
The Benefits of Plant-Based Food and Proteins
Vegan Protein Powder vs Whey Protein for Muscle Gains
Product FAQs
How does Soy Protein Isolate taste?
This product is available in flavoured and unflavoured versions and is generally considered to have an average taste.
What is Soy Protein Isolate made from?
Soy Protein Isolate is a protein derived from soy.
How is Soy Protein Isolate packaged?
Soy Protein Isolate is packaged in resealable 1kg pouches.
Is the packaging for Soy Protein Isolate recyclable?
In theory yes, but not in all council areas right now.
The REDcycle program has been discontinued, and the industry is working together to find a solution to continue recycling soft plastics. For now, we recommend checking with your local council, but most require you to put the packaging in your regular landfill bin.
The included scoop can be recycled as hard plastic in your local council pickup.
For more information about what Bulk is doing to improve sustainability, check this article.
Can I receive a discount buying more than one bag of Soy Protein Isolate at once?
Absolutely! Price breaks for Soy Protein Isolate begin when you purchase 2 units of any flavour. Just add more than that to your cart to see the savings.
Recipes
The Recipe Section of the Bulk Nutrients Blog now has over 300 healthy recipes.
Here are some of our favourites that use Soy Protein Isolate:
Lab Results
At Bulk Nutrients, we take our products’ purity very seriously.
To maintain our Soy Protein’s consistent high quality, we send a cross-section of our product range to certified Australian laboratories for testing, such as National Measurement Institute (NMI), Southern Cross University, ARL and Scientest which are all independently verified and NATA/TGA accredited.
The NMI is a laboratory run by the Australian Government, which is used for police forensic testing, SIA - Sports Integrity Australia drug screening and by multinational food manufacturers for quality and safety testing.
NMI has conducted many hundreds of tests on Bulk Nutrients products for more than 10+ years.
Lab testing results for Soy Protein Isolate.
- 25/06/2026 - Soy Protein Isolate - Vanilla
- 24/02/2026 - Soy Protein Isolate - Raw (Unflavoured)
- 10/10/2025 - Soy Protein Isolate - Raw (Unflavoured)
- 10/06/2025 - Soy Protein Isolate - Chocolate
- 07/02/2025 - Soy Protein Isolate - Vanilla
- 24/01/2024 - Soy Protein Isolate - Chocolate
- 24/01/2024 - Soy Protein Isolate - Raw (Unflavoured)
- 24/01/2024 - Soy Protein Isolate - Vanilla
- 18/07/2023 - Soy Protein Isolate - Chocolate
- 18/07/2023 - Soy Protein Isolate - Raw (Unflavoured)
- 18/07/2023 - Soy Protein Isolate - Vanilla
- 25/01/2023 - Soy Protein Isolate - Chocolate
- 25/01/2023 - Soy Protein Isolate - Raw (Unflavoured)
- 25/01/2023 - Soy Protein Isolate - Vanilla
- 08/07/2022 - Soy Protein Isolate - Chocolate
- 08/07/2022 - Soy Protein Isolate - Raw (Unflavoured)
- 08/07/2022 - Soy Protein Isolate - Vanilla
- 22/07/2021 - Soy Protein Isolate - Raw (Unflavoured)
- 22/07/2021 - Soy Protein Isolate - Vanilla
- 29/01/2021 - Soy Protein Isolate - Chocolate
- 29/01/2021 - Soy Protein Isolate - Raw (Unflavoured)
- 29/01/2021 - Soy Protein Isolate - Vanilla
- 12/12/2019 - Soy Protein Isolate - Chocolate
- 12/12/2019 - Soy Protein Isolate - Raw (Unflavoured)
- 12/12/2019 - Soy Protein Isolate - Vanilla
- 23/07/2019 - Soy Protein Isolate - Raw (Unflavoured)
- 23/07/2019 - Soy Protein Isolate - Vanilla
- 11/07/2018 - Soy Protein Isolate - Vanilla
- 04/07/2018 - Soy Protein Isolate - Raw (Unflavoured)
Nutrition Panels
| CHOCOLATE SOY PROTEIN NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Energy (kj) | 452 | 1,506 |
| Protein (g) | 25.4 | 84.6 |
| Fats (g) | 0.6 | 1.9 |
| (saturated) (g) | 0.2 | 0.8 |
| Carbohydrates (g) | 1.7 | 5.7 |
| (sugars) (g) | 0.2 | 0.8 |
| Fibre (g) | 0.5 | 1.5 |
| Sodium (mg) | 284 | 946 |
| VANILLA SOY PROTEIN NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Energy (kj) | 450 | 1,501 |
| Protein (g) | 26.2 | 87.3 |
| Fats (g) | 0.4 | 1.5 |
| (saturated) (g) | 0.1 | 0.5 |
| Carbohydrates (g) | 1.2 | 4.1 |
| (sugars) (g) | 0.3 | 0.9 |
| Fibre (g) | 0.4 | 1.3 |
| Sodium (mg) | 292 | 972 |
| RAW SOY PROTEIN NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Energy (kj) | 452 | 1,506 |
| Protein (g) | 27.0 | 90.0 |
| Fats (g) | 0.5 | 1.5 |
| (saturated) (g) | 0.2 | 0.51 |
| Carbohydrates (g) | 0.5 | 1.8 |
| (sugars) (g) | 0.2 | 0.5 |
| Fibre (g) | 0.4 | 1.3 |
| Sodium (mg) | 300 | 1000 |
| TYPICAL SOY PROTEIN AMINO ACID PROFILE | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Alanine (mg) | 1,260 | 4,200 |
| Arginine (mg) | 2,400 | 8,000 |
| Aspartic Acid (mg) | 3,630 | 12,100 |
| Cysteine (mg) | 420 | 1,400 |
| Glutamine + Glutamic Acid (mg) | 6,120 | 20,400 |
| Glycine (mg) | 1,260 | 4,200 |
| Histidine (mg) | 810 | 2,700 |
| Isoleucine (mg) | 1,290 | 4,300 |
| Leucine (mg) | 2,340 | 7,800 |
| Lysine (mg) | 1,950 | 6,500 |
| Methionine (mg) | 420 | 1,400 |
| Phenylalanine (mg) | 1,620 | 5,400 |
| Proline (mg) | 1,590 | 4,300 |
| Serine (mg) | 1,710 | 5,700 |
| Threonine (mg) | 1,080 | 3,600 |
| Tryptophan (mg) | 300 | 1,000 |
| Tyrosine (mg) | 1,230 | 4,100 |
| Valine (mg) | 1,350 | 4,500 |
Reviews
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What Our Customers Are Saying
Customers generally praised this soy protein isolate as a good-value, plant-based alternative to whey, highlighting its pleasant, not overly sweet taste and versatility in smoothies, porridge, yoghurt, chia pudding, baking and protein balls. Many found it easy on the stomach and suitable for vegan or dairy-free preferences. Most said it mixed well, particularly when blended, although some found the texture thick, gritty or chalky, requiring extra liquid. A few felt the chocolate and vanilla flavours were too mild.
My favourite protein powder
Chiyoko T on 19/10/2026Verified buyer
I love that it's less sweet than all the whey protein powders I've tried. Much better tasting than any other plant based powders I've tried too. Excellent value for money as well, being much cheaper than whey. Slightly grainy texture which is perhaps not ideal for some, but it doesn't bother me personally.
Excellent!
Danica J on 18/10/2026Verified buyer
Thank you so very very very much for making a product without stevia or sucrolose!!! Finally I can enjoy your quality products without my tastebuds making me run for anything to get rid of the sweetener taste! This product is awesome and easy to mix in a glass of soymilk to give me sustained energy. Thank you!!
Soy Protein Isolate in 1kg Chocolate
Jerson C on 02/10/2026Verified buyer
Bulk Nutrients Soy Protein Isolate in Chocolate is a great option for anyone looking for a convenient plant-based protein. It mixes well, has a pleasant chocolate flavour and provides a good way to increase daily protein intake without being overly heavy. I’ve been happy with the quality and overall value of the product. The only improvement would be the price, as it could be cheaper to remain competitive with other protein brands, particularly for regular or bulk purchasers. Overall, a solid product that I would happily purchase again.
Soy Protein
bruce r on 01/10/2026Verified buyer
So far so good. Ive moved form Whey protein due to cost and dont regret it.
Soy protein
Ashlee W on 28/09/2026Verified buyer
Yummy and great nutritional values!
Good but lacks pesticide testing
EDWARD C on 24/09/2026Verified buyer
Clean and mixes well. Natural flavour that doesn't have too strong a taste. Low heavy metal profile but confirmation of compliance with pesticide levels is lacking.
Adds flavour, protein and bulk to recipes
Malcolm M on 12/09/2026Verified buyer
I used this soy protein isolate to make vanilla protein balls and it worked beautifully. The flavour is subtle and creamy, and it blends easily with no clumping. It made the mixture more cohesive and the final result was really satisfying. Sweetness was just right, and there was no noticeable smell. I’ll definitely buy again and I’m keen to try it in pancakes and yoghurt ice‑cream next.
Good product
Daisy S on 31/08/2026Verified buyer
Good protein!
Good consistency, gut friendly
Bianka B on 17/08/2026Verified buyer
Great macros, easy to digest, tastes relatively neutral in porridge or shakes and has good, smoother consistency compared to most plant proteins. Best soy protein isolate for the price! Also super fast shipping and great customer service :)
Great product
Yuki B on 16/08/2026Verified buyer
The unsweetened soy protein is just right for me.
Soy Protein Isolate
4.52 from 423
Product Overview
Soy Protein is a 100% pure, plant based alternative to traditional dairy proteins. It offers one of the highest nutritional values in any protein.
Taste
Mixability
Effectiveness
Value for Money
Lactose Free
Gluten Free Ingredients
Vegetarian
Vegan
Rewards & Easy Instalments
Point Rewards
or register an account to earn 105 points when you purchase Soy Protein Isolate.
When you reach the Bronze tier, you'll earn 140 points, at the Silver tier earn 175, and 210 points on the Gold Tier. Find out more.
Pay in 4 Payments
For bigger orders over $100 AUD, choose to pay with AfterPay or PayPal Pay in 4. Find out more.
Availability & Shipping
Flat rate $9 shipping Australia-wide. Orders up to 3.5kg ship Express Post, over 3.5kg ship Parcel Post.
Multibuy Discounts
Save on Soy Protein Isolate with multibuy discounts. Add 2 or more bags of any flavour to your cart and start saving.
Price Per Bag
- 1kg = $35.00
- 2kg (2 x 1kg) bags = $33.00 each
- 3kg (3 x 1kg) bags = $32.00 each
- 4kg (4 x 1kg) bags = $31.00 each
- 5kg (5 x 1kg) bags = $30.40 each
- 10kg (10 x 1kg) bags = $29.40 each