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Isopure Zero Carb vs Optimum Nutrition Gold Standard

Updated By the HealthWorld editorial teamHow we pick

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The short answer

Isopure Zero Carb is a pure whey isolate with 25 g of protein and 0 g of carbs and sugar per serving, which makes it the better fit for keto, low-carb or lactose-sensitive users. Gold Standard is an isolate-led blend with 24 g of protein, 5.5 g of BCAAs and a much bigger flavor range. If carbs don't matter to you, Gold Standard is the more versatile everyday shake.

Isopure Zero Carb Whey Isolate

Choose Isopure Zero Carb Whey Isolate if…

  • You count carbs or follow keto
  • You're sensitive to lactose and prefer a pure isolate
  • You want the leanest macros per scoop
Optimum Nutrition Gold Standard 100% Whey

Choose Optimum Nutrition Gold Standard 100% Whey if…

  • You want a classic, versatile whey for daily use
  • You like having lots of flavors to choose from
  • A few carbs per scoop don't matter to you

Side by side

Isopure Zero Carb Whey IsolateOptimum Nutrition Gold Standard 100% Whey
Protein per serving25 g24 g
Protein type100% whey isolateWhey blend; isolate is the primary ingredient
Carbs0 gLow, but not zero; check the label
BCAAsCheck the label5.5 g
FlavorsSeveral, including unflavoredHuge range, including unflavored
Diet fitKeto and low-carbMost everyday diets

Where to buy

Frequently asked questions

Is Isopure better than Gold Standard?

It's better for specific needs: zero carbs, keto or lactose sensitivity, thanks to its pure isolate formula. For most people who simply want a good everyday whey, Gold Standard offers nearly the same protein per scoop and more flavor choice. Both are long-running, trusted brands.

Is protein powder good for weight loss?

It can help by making it easier to reach your protein target, which keeps you fuller. Either of these works within a calorie deficit; Isopure's zero carbs make it slightly easier to fit into low-carb plans.

Is protein powder bad for your kidneys?

Research in healthy people hasn't shown that protein powder harms the kidneys. If you have kidney disease or reduced kidney function, talk to your doctor before using it, as you may need to limit protein.

Sources