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Gold Standard 100% Isolate by Optimum Nutrition

4.8
Rated 4.8 out of 5 stars
58 Reviews
write a review
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  • Ultra-pure whey isolate
  • Fast digestion & absorption
  • Low sugar, no added fats

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2025 Supplement Award Winner
  • 2 nd
    Brand of the Year

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Recharge your body with fast-absorbing, ultra-pure whey isolate

Gold Standard 100% Isolate by Optimum Nutrition is crafted for those who value high-performance protein with next-level purity. Through advanced filtration techniques, this premium whey isolate delivers a refined protein source designed to support your recovery routine, post-training nutrition, and overall lean muscle maintenance. Known for its rapid absorption, low sugar content and smooth mixability, it's ideal for athletes and fitness enthusiasts looking for a clean, convenient protein shake. Whether you're aiming to support muscle recovery or simply want a protein that fits into a lean eating plan, this option delivers uncompromising quality.

Benefits of Gold Standard 100% Isolate by Optimum Nutrition:

  • Fast-digesting whey isolate for post-workout support
  • Ultra-clean formula with minimal carbs and no added fats
  • Designed to be gentle on digestion and easy to mix
  • Only 1g of sugar per serving for lean physique support
  • Trusted by athletes for consistent performance results

Is this protein suitable for lean body goals?
Yes. Gold Standard 100% Isolate contains minimal carbohydrates, no added fats, and just 1g of sugar per serve, making it a great fit for lean and clean nutrition plans.

Can this support my post-workout recovery needs?
Absolutely. With 25g of quality whey isolate per serving, it offers the protein and amino acid profile needed to aid in muscle repair and recovery after intense sessions.

Gold Standard 100% Isolate by Optimum Nutrition is the go-to choice for those seeking a high-quality protein source that blends fast, feels light, and fuels performance.

Mix 30 g (about 1 scoop) of whey isolate powder with 180-240 mL of cold water, milk, or your preferred beverage. Stir, shake, or blend for 30 seconds until fully dissolved. For best results, consume as part of a balanced diet and exercise program to meet your daily protein requirements.
24 Serves / Chocolate Bliss
NUTRITION INFORMATION Per serve / Per 100 g
Energy 461 kJ / 1502 kJ
110 kcal / 359 kcal
Protein 25 g / 81 g
Fat, total 0.5 g / 2 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 0 g / 0 g
Sodium 190 mg / 613 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Cocoa (Processed with Alkali), Flavours, Salt, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

24 Serves / Rich Vanilla
NUTRITION INFORMATION Per serve / Per 100
Energy 442 kJ / 1462 kJ
106 kcal / 350 kcal
Protein 25 g / 83 g
Fat, total 0 g / 0 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 1 g / 3 g
Sodium 80 mg / 267 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Flavours, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

44 Serves / Chocolate Bliss
NUTRITION INFORMATION Per serve / Per 100 g
Energy 461 kJ / 1502 kJ
110 kcal / 359 kcal
Protein 25 g / 81 g
Fat, total 0.5 g / 2 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 0 g / 0 g
Sodium 190 mg / 613 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Cocoa (Processed with Alkali), Flavours, Salt, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

44 Serves / Rich Vanilla
NUTRITION INFORMATION Per serve / Per 100
Energy 442 kJ / 1462 kJ
106 kcal / 350 kcal
Protein 25 g / 83 g
Fat, total 0 g / 0 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 1 g / 3 g
Sodium 80 mg / 267 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Flavours, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

76 Serves / Chocolate Bliss
NUTRITION INFORMATION Per serve / Per 100 g
Energy 461 kJ / 1502 kJ
110 kcal / 359 kcal
Protein 25 g / 81 g
Fat, total 0.5 g / 2 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 0 g / 0 g
Sodium 190 mg / 613 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Cocoa (Processed with Alkali), Flavours, Salt, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

76 Serves / Rich Vanilla
NUTRITION INFORMATION Per serve / Per 100
Energy 442 kJ / 1462 kJ
106 kcal / 350 kcal
Protein 25 g / 83 g
Fat, total 0 g / 0 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 1 g / 3 g
Sodium 80 mg / 267 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Flavours, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

Warning

This product is not a sole source of nutrition and should be consumed in conjunction with a nutritious diet and an appropriate training or exercise program. Not suitable for children under 15 years of age or pregnant women: Should only be used under medical or dietetic supervision.

Orders placed before 3PM AEST, Monday to Friday (not including Public Holidays), will be shipped the same day! Once your payment clears and despatch information is available we'll email you an order tracking number. Most customers receive their supplements in 1-2 business days! As long as:

  • You order before 3pm (AEST) Mon-Fri
  • You use a payment method with instant clearance, like Paypal Instant Payment or Credit Card
  • Your parcel is less than 5kg in cubic weight. (Some bulky goods will not apply)
  • You are not in a remote location

Please note parcels going via Australia Post (PoBox, Defence Adresses) may take longer than 1-3 business days.

Parcels going to NT, and bulky parcels going to WA may take 5+ business days to arrive.

If your order weighs more than 5kg or is bulky: Heavy or bulky orders are sent via road freight which means that the estimated delivery time will be longer than orders sent via air freight.

If you have used an alternate payment method: Direct bank deposit or Paypal Echeque may take some time to clear. To get your supplements in the shortest time possible, use Paypal's Instant Payment or a credit card.

Shipping Policy
More Information

Recharge your body with fast-absorbing, ultra-pure whey isolate

Gold Standard 100% Isolate by Optimum Nutrition is crafted for those who value high-performance protein with next-level purity. Through advanced filtration techniques, this premium whey isolate delivers a refined protein source designed to support your recovery routine, post-training nutrition, and overall lean muscle maintenance. Known for its rapid absorption, low sugar content and smooth mixability, it's ideal for athletes and fitness enthusiasts looking for a clean, convenient protein shake. Whether you're aiming to support muscle recovery or simply want a protein that fits into a lean eating plan, this option delivers uncompromising quality.

Benefits of Gold Standard 100% Isolate by Optimum Nutrition:

  • Fast-digesting whey isolate for post-workout support
  • Ultra-clean formula with minimal carbs and no added fats
  • Designed to be gentle on digestion and easy to mix
  • Only 1g of sugar per serving for lean physique support
  • Trusted by athletes for consistent performance results

Is this protein suitable for lean body goals?
Yes. Gold Standard 100% Isolate contains minimal carbohydrates, no added fats, and just 1g of sugar per serve, making it a great fit for lean and clean nutrition plans.

Can this support my post-workout recovery needs?
Absolutely. With 25g of quality whey isolate per serving, it offers the protein and amino acid profile needed to aid in muscle repair and recovery after intense sessions.

Gold Standard 100% Isolate by Optimum Nutrition is the go-to choice for those seeking a high-quality protein source that blends fast, feels light, and fuels performance.

Mix 30 g (about 1 scoop) of whey isolate powder with 180-240 mL of cold water, milk, or your preferred beverage. Stir, shake, or blend for 30 seconds until fully dissolved. For best results, consume as part of a balanced diet and exercise program to meet your daily protein requirements.
24 Serves / Chocolate Bliss
NUTRITION INFORMATION Per serve / Per 100 g
Energy 461 kJ / 1502 kJ
110 kcal / 359 kcal
Protein 25 g / 81 g
Fat, total 0.5 g / 2 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 0 g / 0 g
Sodium 190 mg / 613 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Cocoa (Processed with Alkali), Flavours, Salt, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

24 Serves / Rich Vanilla
NUTRITION INFORMATION Per serve / Per 100
Energy 442 kJ / 1462 kJ
106 kcal / 350 kcal
Protein 25 g / 83 g
Fat, total 0 g / 0 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 1 g / 3 g
Sodium 80 mg / 267 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Flavours, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

44 Serves / Chocolate Bliss
NUTRITION INFORMATION Per serve / Per 100 g
Energy 461 kJ / 1502 kJ
110 kcal / 359 kcal
Protein 25 g / 81 g
Fat, total 0.5 g / 2 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 0 g / 0 g
Sodium 190 mg / 613 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Cocoa (Processed with Alkali), Flavours, Salt, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

44 Serves / Rich Vanilla
NUTRITION INFORMATION Per serve / Per 100
Energy 442 kJ / 1462 kJ
106 kcal / 350 kcal
Protein 25 g / 83 g
Fat, total 0 g / 0 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 1 g / 3 g
Sodium 80 mg / 267 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Flavours, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

76 Serves / Chocolate Bliss
NUTRITION INFORMATION Per serve / Per 100 g
Energy 461 kJ / 1502 kJ
110 kcal / 359 kcal
Protein 25 g / 81 g
Fat, total 0.5 g / 2 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 0 g / 0 g
Sodium 190 mg / 613 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Cocoa (Processed with Alkali), Flavours, Salt, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

76 Serves / Rich Vanilla
NUTRITION INFORMATION Per serve / Per 100
Energy 442 kJ / 1462 kJ
106 kcal / 350 kcal
Protein 25 g / 83 g
Fat, total 0 g / 0 g
- Saturated 0 g / 0 g
Carbohydrate 1 g / 3 g
- Sugars 1 g / 3 g
Sodium 80 mg / 267 mg

Ingredients - Hydrolyzed Whey Protein Isolate [MILK], Whey Protein Isolate [MILK] (Emulsifier: SOY Lecithin), Flavours, Sweetener (955).

Allergen Statement - Contains Milk and Soy.

Nutrition information may vary slightly between flavours. For details on a specific flavour, please contact customer service.

Warning

This product is not a sole source of nutrition and should be consumed in conjunction with a nutritious diet and an appropriate training or exercise program. Not suitable for children under 15 years of age or pregnant women: Should only be used under medical or dietetic supervision.

Orders placed before 3PM AEST, Monday to Friday (not including Public Holidays), will be shipped the same day! Once your payment clears and despatch information is available we'll email you an order tracking number. Most customers receive their supplements in 1-2 business days! As long as:

  • You order before 3pm (AEST) Mon-Fri
  • You use a payment method with instant clearance, like Paypal Instant Payment or Credit Card
  • Your parcel is less than 5kg in cubic weight. (Some bulky goods will not apply)
  • You are not in a remote location

Please note parcels going via Australia Post (PoBox, Defence Adresses) may take longer than 1-3 business days.

Parcels going to NT, and bulky parcels going to WA may take 5+ business days to arrive.

If your order weighs more than 5kg or is bulky: Heavy or bulky orders are sent via road freight which means that the estimated delivery time will be longer than orders sent via air freight.

If you have used an alternate payment method: Direct bank deposit or Paypal Echeque may take some time to clear. To get your supplements in the shortest time possible, use Paypal's Instant Payment or a credit card.

Shipping Policy
4.8
Rated 4.8 out of 5 stars
Based on 58 reviews
Total 5 star reviews: 49 Total 4 star reviews: 8 Total 3 star reviews: 1 Total 2 star reviews: 0 Total 1 star reviews: 0
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98%would recommend this product
Rating
Ratings
Write a Review (Opens in a new window)
58 reviews
  • HB
    Hany B.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    10 months ago
    Best protein for all your needs

    I’ve been using GSI for many years now and by far it’s one of the best if not the best for all your needs.

    The best tasting protein that I have tried and trust me I tried so many of them.

    Great for pre and after workout at the gym and can also help you gain or lose weight depending on your diet.

    If you’re looking for results then look no further.

    TasteRated 5.0 on a scale of 1 to 5
    TextureRated 5.0 on a scale of 1 to 5
    Value for moneyRated 5.0 on a scale of 1 to 5
    Was this helpful?
  • AA
    Akash A.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    11 months ago
    Awesome Protein

    It does what is says, gained 300g muscle mass in 3 weeks. Recommend 100%

    TasteRated 5.0 on a scale of 1 to 5
    TextureRated 5.0 on a scale of 1 to 5
    Value for moneyRated 5.0 on a scale of 1 to 5
    Was this helpful?
  • YM
    Yining M.
    Verified Reviewer
    I recommend this product
    Rated 4 out of 5 stars
    1 year ago
    Good protein

    It’s a good source of protein, but a little bit too sweet for me

    TasteRated 3.0 on a scale of 1 to 5
    TextureRated 4.0 on a scale of 1 to 5
    Value for moneyRated 4.0 on a scale of 1 to 5
    Was this helpful?
  • JH
    Joshua H.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    15 minutes ago
    Gold Standard

    Delicious

    TasteRated 5.0 on a scale of 1 to 5
    TextureRated 5.0 on a scale of 1 to 5
    Value for moneyRated 4.0 on a scale of 1 to 5
    Was this helpful?
    Nutrition Warehouse
    4 minutes ago

    Thanks Joshua! 🙌 So stoked you're loving the Gold Standard 100% Isolate by Optimum Nutrition with how it's delivering that delicious taste you're after - having it taste so good while giving you all those premium isolate protein benefits is exactly what we want to hear! That kind of satisfaction with how well it's hitting those taste buds speaks volumes about how well we've got it right! Sounds like we've absolutely nailed it with delivering exactly what you're after when it comes to a whey protein isolate that brings both the amazing flavor and quality nutrition without any fuss! Love that it's earning that perfect 5-star rating from you! 💪✨

  • RC
    Rose C.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    Best Protein Powder ever !@

    Best Protein Powder Ever !!

    TasteRated 5.0 on a scale of 1 to 5
    TextureRated 5.0 on a scale of 1 to 5
    Value for moneyRated 5.0 on a scale of 1 to 5
    Was this helpful?
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