Gold Standard 100% Isolate Protein
by Optimum Nutrition
Pure protein, minimal extras: filtered for maximum protein content with very low fat and carbs per serving.
- Up to 25g protein per serving
- Low fat - under 3g per 100g
- Low carb - suitable for keto and cutting diets
- Extra filtered for reduced lactose
- For shakes, smoothies, baking and more
Flavour pictures illustrate the taste, not the powder's colour or ingredients.
Best price today
In stock£55.80
£6.00 / 100g
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Transparent protein profile
What's inside
Values per 100g, with the amount in one 30g serving
83g protein
24.9g per 30g serving with minimal filler
5g carbohydrates
1.3g per 30g serving - low carb
1g fat
0.4g per 30g serving - very lean
366 kcal
110 kcal per 30g serving
View full nutritional information
| Nutrient | Per 100g | Per serving (30g) |
|---|---|---|
| Protein | 83g | 24.9g |
| Calories | 365.92 kcal | 110 kcal |
| Carbohydrates | 4.5g | 1.3g |
| Fat | 1.4g | 0.4g |
Know when to buy
Price history
Lowest price on record, any flavour or size
£4.90/100g (£45.59 for 930g on 12 Jul 2026)
930g · all flavours · price per pack
- Amazon UKlatest £55.80, lowest £48.28, highest £58.00 in the last 90 days
Quick answers
Is this right for you?
Who is it for?
Optimum Nutrition Gold Standard 100% Isolate Protein is designed for athletes, lean-bulk dieters, and anyone who wants maximum protein with minimal fat and carbs. Whey isolate is also a better option for people with mild lactose sensitivity, since the extra filtration removes most of the lactose.
What can you expect?
A lean, fast-absorbing protein with very low fat and carbohydrate content. Whey isolate goes through extra filtration to deliver 85-95% protein purity, which means more protein per scoop and fewer calories from filler. Expect quick absorption, making it ideal straight after a workout. With 83g of protein per 100g (around 25g per 30g serving), Optimum Nutrition Gold Standard 100% Isolate Protein sits at the higher end for a whey isolate product.
What else do you need to know?
Optimum Nutrition Gold Standard 100% Isolate Protein is a whey isolate protein powder made by Optimum Nutrition. It comes in 450g, 930g 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 Optimum Nutrition Gold Standard 100% Isolate Protein in the UK?
We refresh Optimum Nutrition Gold Standard 100% Isolate Protein pricing daily from Amazon UK and show the fetch time next to every figure. If no verified price is showing above, we do not currently hold one we would stand behind, and the buy button will take you to the live listing to check.
How much protein does Gold Standard 100% Isolate Protein contain per 100g?
Gold Standard 100% Isolate Protein contains 83g of protein per 100g, with 24.9g per 30g serving. It is a whey isolate product.
Is Optimum Nutrition Gold Standard 100% Isolate Protein currently in stock?
At the last check, 9 out of 9 tracked variants were in stock. Stock status carries the same fetch time as the price shown above, so check the retailer listing before ordering.
Pick your pack
2 sizes · Chocolate · cost per 100g for each
The 930g works out at £4.90 per 100g. The 450g costs £6.67. Same powder, 1.4x the price per gram.
Where to buy in the UK
Chocolate · 930g · 2 offers for this selection · sorted by cost per 100g
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