Product Comparison: Optimum Nutrition Gold Standard 100% Whey vs Isopure Low Carb

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General Specifications
Optimum Nutrition
Gold Standard 100% Whey
Low Carb
About the Product
OPTIMUM NUTRITION'S GOLD STANDARD 100% Whey uses pure Whey Protein Isolates as the primary ingredient. Combined with ultra-filtered whey protein concentrate, each serving provides 24 grams of all-whey protein and 5.5 grams of naturally occurring Branched Chain Amino Acids (BCAAs) which are prized by athletes for their muscle building qualities.
Pack in powerfully pure protein, without packing on the carbs. Our 100% whey protein isolate powders amp you up, without any unwanted weight. Just pick your level: Zero Carb or Low-Carb (which also has ZERO sugar), both with 25 grams of protein per scoop.
Key Specs
5 lbs.
3 lbs.
Serving Size
30.4 grams
33 grams
Dutch Chocolate
What customers say about "Key Specs"
Optimum Nutrition Gold Standard 100% Whey Protein Powder, Double Rich Chocolate, 5 Pound
  • Quality product, few ingredients. High percentage by volume of protein per serving.
  • The price vs volume vs protein per serving ratio can't be beat. Very happy with my purchase.
  • This product has the best volume to price ratio I could find. It tastes great, and it really seems to help.
  • Optimum Nutrition definitely manufactures quality supplements and this is probably their highest volume product.
  • Double chocolate flavour taste really bad!! Please don’t buy it. It used to taste very good but I don’t know what happened.
Isopure Low Carb Keto Friendly Protein Powder, 100% Whey Protein Isolate
  • I bought Isopure Mint Chocolate Chip flavour because it sounded good but it tastes funny.
  • This natural protein comes in various flavours but dutch chocolate is THE BEST
  • So Isopure really is the best. Soooo happy they thought about making a coffee flavour! Keep up the great work guys! Hope you don't discontinue this flavour!!!
  • Delivers a large volume of my protein for the day in an easy to digest and flavorful shake. T
  • I ordered the Espresso flavour but it was a little sweet not strong coffee taste
Size & Weight
10.8 in.
6 in.
8 in.
5 in.
8 in.
5 in.
5.6 lbs.
3.3 lbs.
Amount Per Serving
24 grams
25 grams
3 grams
1 grams
1 gramms
0.5 gramms
Other Components
Cholesterol - 30mg, Sodium - 130mg, Sugars - 1g, Vitamin A, Vitamin С, Calcium, Iron
Cholesterol - 10mg, Calcium, Iron, Vitamin A, Vitamin С, Vitamin K, Vitamin E, Thiamin
What customers say about "Amount Per Serving"
Optimum Nutrition Gold Standard 100% Whey Protein Powder, Double Rich Chocolate, 5 Pound
  • This whey contains little else in terms of sugar or carbohydrates so you know there are no fillers.
  • This protein, along with physical activity, will help to stave off muscle loss. Their article made good sense, so I am following their advice: eat lightly and eat protein along with enough fiber.
  • This product is 100% whey from isolates so if you're trying to hit a protein goal while keeping your daily caloric intake down, this is for you.
  • It has worked wonderfully so far allowing me to put on some mass without gaining the fat of other protein supplements. I just ordered another batch and I am a proud user of ON Whey!!
  • If anyone has recommendations on a good protein shake that will give loads of energy for pre-workout let me know.
Isopure Low Carb Keto Friendly Protein Powder, 100% Whey Protein Isolate
  • I only use half the recommended serving size (one scoop instead of the recommended two) so I usually get 2-3 months out of a tub.
  • The nutrition facts say a serving is two scoops (50g protein), but I use just one scoop (25g of protein) and the canister lasts twice as long.
  • This is truly the best option when you factor in the above and the amount of protein per serving. UNBEATABLE!
  • What I particularly like is the fact that each serving contains the equivalent of a multi vitamin, PLUS lots of potassium.
  • It shows each serving as 3 carbs with 1 fiber; a net of 2 carbs. This is not extreme, but still does not match what is advertised.
Box Type
Contains Soy
Contains Milk
Gluten & Lactose Free
Whey Protein Isolate (WPI) Main Ingredient, Over 4 Grams of Glutamine & Glutamic Acid in Each Serving, More Than 5 Grams of the Naturally Occurring BCAAs, The "Gold Standard" for Protein Quality
Muscle Building & Recovery, Weight Management Support, Supports Muscle Health As We Age
What customers say about "Features"
Optimum Nutrition Gold Standard 100% Whey Protein Powder, Double Rich Chocolate, 5 Pound
  • Taste is good, not with water but fat free milk
  • It mixes extremely well (I use milk mainly) and when mixed with other powders, it continued to mix well (I add extra probiotics and stuff for my joints).
  • In milk it's just about as good as a chocolate milkshake. I have to resist the urge to drink more just for the enjoyment. In water it's not quite that good but still very tasty.
  • Mixes really well and quickly with anything including a stick.
  • Everything in the box was in perfect condition except for the gold standard so that means they put it there all damaged in the first place.
Isopure Low Carb Keto Friendly Protein Powder, 100% Whey Protein Isolate
  • The taste is just as good. Not overly sweet, and great when mixed with Almond milk.
  • Typically it mixes very well in water, and you don't even need to use a protein shaker, just mix it in a cup with a fork and it mixes so well.
  • I mix it with another brands caffeinated peanut butter powder and milk and it’s so good.
  • It mixed with water in the same protein shaker bottle just fine. The third order had the same outer plastic seal, but the inner paper seal was stuck inside the lid as well.
  • It doesn't mix well & gets sticky instead of dissolving. I once again question if this is the same powder.
Warranty / Certifications
Manufacturer Warranty
2 year(s)
GMP compliant, NSF Certified
NSF Certified, GMP compliant
Other Information

Price History

Other reviews