100% Soy Protein

by Prozis

Plant-powered performance: a dairy-free protein source that delivers on taste, nutrition, and sustainability.

Up to 25g protein per serving
Low fat - under 3g per 100g
Low carb - suitable for keto and cutting diets
100% plant-based and dairy-free
For shakes, smoothies, baking and more

Choose flavour4 flavours

Flavour pictures illustrate the taste, not the powder's colour or ingredients.

Size900g

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In stock

£16.09

£1.79 / 100g

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Transparent protein profile

What's inside

Values per 100g, with the amount in one 30g serving

84g protein

25.2g per 30g serving with minimal filler

5g carbohydrates

1.5g per 30g serving - low carb

1g fat

0.2g per 30g serving - very lean

367 kcal

110 kcal per 30g serving

View full nutritional information

Nutrition per 100g and per 30g serving
Nutrient	Per 100g	Per serving (30g)
Protein	84g	25.2g
Calories	367.3 kcal	110 kcal
Carbohydrates	4.9g	1.5g
Fat	0.5g	0.2g

Know when to buy

Price history

Lowest price on record, any flavour or size

£1.79/100g (£16.09 for 900g on 13 Oct 2026)

900g · all flavours · price per pack

Prozislatest £16.09 (one check so far)

Quick answers

Is this right for you?

Who is it for?

Prozis 100% Soy Protein is designed for plant-based athletes, vegans, and anyone looking to avoid dairy. It also suits people with lactose intolerance or those who prefer a more sustainable protein source without compromising on their daily protein targets.

What can you expect?

A plant-derived protein that delivers a complete amino acid profile without any animal products. Modern vegan proteins have come a long way in taste and texture. You can expect smooth mixing, solid protein content, and a product free from dairy, lactose, and cholesterol. With 84g of protein per 100g (around 25g per 30g serving), Prozis 100% Soy Protein sits at the higher end for a vegan product.

What else do you need to know?

Prozis 100% Soy Protein is a vegan protein powder made by Prozis. It comes in 900g sizes. Every price on WheyWise is read from the retailer’s own page and re-checked daily and sorted by cost per 100g, so you can see both the cheapest option and how current it is. All links to Amazon and retailer sites are affiliate links - this is how WheyWise stays free.

Frequently asked questions

Where is the cheapest place to buy Prozis 100% Soy Protein in the UK?

The best price we have verified today is £1.79 per 100g for the 900g bag, checked 13 Oct 2026. Use the buy button above to go straight to it.

How much protein does 100% Soy Protein contain per 100g?

100% Soy Protein contains 84g of protein per 100g, with 25.2g per 30g serving. It is a vegan product.

Is Prozis 100% Soy Protein currently in stock?

At the last check, 4 out of 4 tracked variants were in stock. Stock status carries the same fetch time as the price shown above, so check the retailer listing before ordering.