Best for protein density
Dymatize ISO100
The reviewed Strawberry label provides 25g protein for 110 calories and a 30g scoop.
Whey protein comparison
Dymatize ISO100 vs Optimum Nutrition Gold Standard: Which Should You Buy?
Buy Dymatize ISO100 if you prioritize protein density, an isolate-focused formula, or tighter calories. Buy Optimum Nutrition Gold Standard Whey if you tolerate whey concentrate and it gives you the lower cost per 30g protein. For muscle gain, the difference is too small to make either product an automatic winner.
Reviewed for source accuracy and calculator consistency by the ProteinCalc editorial team. Research and methodology by Jitendra Kumar Kumawat, Researcher & Tool Creator, against the sources and methodology policy. Jitendra is not a registered dietitian or licensed medical provider.Last updated: August 31, 2026
Sources reviewed
- ISO100 Hydrolyzed Protein Powder - Dymatize
- ISO100 Strawberry Nutrition Facts and Ingredients - Dymatize
- Gold Standard 100% Whey Protein - Optimum Nutrition
- ISO100 Hydrolyzed Protein Powder (USA) - Informed Choice
- ON Gold Standard 100% Whey (USA) - Informed Choice
- International Society of Sports Nutrition Position Stand: protein and exercise - Journal of the International Society of Sports Nutrition
- How to Understand and Use the Nutrition Facts Label - U.S. Food and Drug Administration
How this comparison was made
This is an editorial label comparison, not a sponsored ranking, lab assay, or hands-on taste test. The numerical table uses the U.S. ISO100 Strawberry and Gold Standard Delicious Strawberry labels reviewed on August 31, 2026. Formulas, serving sizes, nutrition, certifications, and prices can change by flavor, size, country, and production batch. There are no affiliate links on this page.
Quick Verdict
Best for lower-lactose priority
Dymatize ISO100
All protein comes from whey isolate; Gold Standard also contains whey concentrate.
Best value for most buyers
Gold Standard
Choose it when its cost per 30g protein is lower and you tolerate whey concentrate well.
Best for muscle gain
Practical tie
Both give a complete whey dose. Training and total daily protein matter more than the 1g difference.
The short answer
ISO100 is the technically leaner formula. Its reviewed Strawberry label provides 25g protein for 110 calories, and all of that protein comes from hydrolyzed whey protein isolate and whey protein isolate. Gold Standard Delicious Strawberry provides 24g protein for 120 calories from a blend led by whey isolate but also containing whey concentrate and hydrolyzed whey protein.
That label advantage does not mean ISO100 will produce visibly better muscle gain. Both provide a useful complete whey dose and 5.5g BCAAs per serving. If Gold Standard is materially cheaper per gram of protein and you digest it well, paying a premium for ISO100 may not improve your real-world outcome.
Nutrition facts compared
These are representative U.S. Strawberry labels, not universal brand values. Chocolate, coffee, cereal, licensed dessert, and other flavors can have different scoop weights, calories, sodium, fats, carbohydrates, sweeteners, and allergens.
| Metric | Dymatize ISO100 Strawberry | ON Gold Standard Delicious Strawberry | Edge |
|---|---|---|---|
| Serving size | 30g (1 scoop) | 31g (about 1 scoop) | ISO100 |
| Calories | 110 | 120 | ISO100 |
| Protein | 25g | 24g | ISO100 |
| Protein per 100 calories | 22.7g | 20g | ISO100 |
| Protein by scoop weight | 83.3% | 77.4% | ISO100 |
| Total fat | 1g | 1.5g | ISO100 |
| Saturated fat | 0g | 1g | ISO100 |
| Carbohydrate | 2g | 3g | ISO100 |
| Total sugar | 1g | 2g | ISO100 |
| Sodium | 75mg | 130mg | ISO100 |
| Cholesterol | 10mg | 60mg | ISO100 |
| BCAAs | 5.5g | 5.5g | Tie |
Protein-per-calorie and scoop-density values are calculated from the reviewed labels and rounded to one decimal place. They are editorial calculations, not manufacturer claims.
Dymatize ISO100
Choose it for isolate and leaner macros
- Protein source: hydrolyzed whey protein isolate plus whey protein isolate.
- Best fit: tighter calorie targets, higher protein density, and people who want to avoid a whey-concentrate formula.
- Label advantage: 1g more protein with 10 fewer calories in the reviewed Strawberry comparison.
- Watch: it still contains milk and soy, uses sucralose, and may cost more per gram of protein.
Optimum Nutrition Gold Standard
Choose it when the blend gives better value
- Protein source: whey blend with isolate first, followed by concentrate and hydrolyzed whey protein.
- Best fit: everyday supplementation when ordinary whey digests well and normalized price is lower.
- Practical strength: the same stated 5.5g BCAAs as ISO100 and a similarly useful 24g complete-protein dose.
- Watch: concentrate makes it a less obvious choice for lactose-sensitive shoppers, and labels vary widely by flavor.
What actually separates them?
1. Isolate-only protein vs a whey blend
Dymatize says 100% of ISO100's protein comes from whey protein isolate. The reviewed Strawberry ingredient list starts with hydrolyzed whey protein isolate, followed by whey protein isolate. Gold Standard lists isolate first, but it is explicitly a blend that also contains whey concentrate and hydrolyzed whey protein. Ingredient order tells you what appears by weight; it does not reveal the exact percentage of each whey fraction.
2. Protein density
ISO100's 25g protein in a 30g scoop means about 83.3% of the powder weight is protein. Gold Standard's 24g in a 31g scoop is about 77.4%. On a calorie basis, ISO100 provides about 22.7g protein per 100 calories versus 20g. ISO100 therefore wins the label-efficiency comparison, although both remain protein-dense products.
3. Lactose and digestion
Isolate processing removes more lactose, fat, and carbohydrate than concentrate, so ISO100 is the more logical first trial for someone who is lactose-sensitive. But neither reviewed U.S. label states a precise lactose amount, and lower lactose does not guarantee symptom-free digestion. Sweeteners, flavor systems, serving size, milk proteins, and individual tolerance can also matter. Neither product is appropriate for a milk-protein allergy.
4. Muscle gain and recovery
Both products provide complete, leucine-rich whey in a practical post-workout dose. ISO100 states 2.6g leucine and 5.5g BCAAs; Gold Standard states 5.5g BCAAs but does not publish a separate leucine value on the reviewed U.S. product page. We found no direct clinical trial comparing these two branded formulas. It would therefore be misleading to claim that one produces superior long-term hypertrophy from the label alone.
5. Ingredients and sweeteners
The reviewed ISO100 Strawberry formula lists natural and artificial flavors, sucralose, soy lecithin, and steviol glycosides after its whey isolates. The reviewed Gold Standard Delicious Strawberry formula lists natural and artificial flavor, sunflower and/or soy lecithin, citric acid, beet juice powder for color, and sucralose after its whey blend. Both contain milk and soy. Neither ingredient list is automatically better; choose according to allergies, sweetener tolerance, and the exact flavor label.
6. Testing and sport eligibility
Both brand pages say the products are banned-substance tested, and both U.S. product names appear in the Informed Choice directory. That is useful evidence, but athletes should not convert a product-level listing into a lifetime, brand-wide guarantee. Verify the exact product, region, flavor, batch, and expiration in the current certification directory before relying on it for a tested-sport decision.
Price and value: use this break-even rule
Prices change too frequently for a durable article to declare a permanent value winner. Calculate:
Cost per 30g protein = tub price ÷ (servings × protein per serving) × 30
Fast per-serving shortcut
Using the reviewed 25g and 24g labels, ISO100 can cost about 4.2% more per serving and still have the same cost per gram of protein as Gold Standard.
When a premium is rational
Pay more for ISO100 only when the isolate formula, calorie difference, or personal tolerance is valuable to you—not because “hydrolyzed” guarantees more muscle.
Which one should you buy?
You are sensitive to lactose but do not have a milk allergy
Start with ISO100
Its protein comes entirely from isolate and the formula excludes whey concentrate. It is not guaranteed lactose-free, so test tolerance carefully.
You digest ordinary whey without symptoms
Buy the better value
Gold Standard can be the smarter everyday purchase when its normalized cost is lower. The blend is still a complete, high-quality protein.
You are cutting and every calorie matters
ISO100
The reviewed label gives slightly more protein with 10 fewer calories, plus less fat, carbohydrate, and sugar.
You want the best muscle-building result
Either
Both clear a practical 20-25g whey dose. Choose the product you tolerate, can afford, and will use consistently while meeting your daily target.
You are a tested athlete
Verify the exact tub
Both appear in Informed Choice product directories, but certification can depend on region, formulation, flavor, and batch. Check the current listing before purchase.
You have a milk-protein allergy
Neither
Both are milk-derived whey products. Lower lactose does not make whey isolate safe for a milk-protein allergy.
Who should pause before buying either?
- Anyone with a milk-protein allergy; both products contain milk.
- Anyone with a soy allergy; the reviewed labels contain soy or soy lecithin.
- People with kidney disease, advanced liver disease, or a prescribed protein limit.
- People who repeatedly experience bloating, diarrhea, reflux, or skin reactions after whey.
- Pregnant or breastfeeding users who need supplement-specific professional guidance.
- Athletes who have not verified the exact product and batch for their testing program.
This page is general product education, not medical advice or a substitute for a physician, registered dietitian, pharmacist, allergy specialist, or sports-governing-body policy.
Frequently Asked Questions
Is Dymatize ISO100 better than Optimum Nutrition Gold Standard Whey?
ISO100 is better when protein density, an isolate-focused formula, tighter calories, or lower-lactose positioning matters most. Gold Standard may be the better buy when you tolerate whey concentrate and it has a meaningfully lower cost per 30 grams of protein. Neither is universally better.
Which is better for muscle gain: ISO100 or Gold Standard?
For most healthy lifters, it is a practical tie. The reviewed products provide 25 grams and 24 grams of complete whey protein respectively, with 5.5 grams of BCAAs each. There is no direct head-to-head clinical trial here showing that one brand builds more muscle. Daily protein, resistance training, calories, sleep, and consistency matter more than the small label difference.
Is ISO100 lactose-free?
Do not assume that it is completely lactose-free unless the exact tub in your market says so. Dymatize says ISO100 is filtered to remove excess lactose and all of its protein comes from isolate, so it is generally the more logical first choice for lactose sensitivity. It still contains milk and is not suitable for a milk-protein allergy.
Is Gold Standard Whey an isolate?
No. Whey protein isolate is the first protein ingredient, but Gold Standard is a blend that also contains whey protein concentrate and hydrolyzed whey protein. Buyers who specifically want protein only from isolate should choose a true isolate product such as ISO100 instead.
Does hydrolyzed whey make ISO100 build muscle faster?
Hydrolysis pre-breaks some protein chains and may change digestion speed, but the product label does not prove greater long-term muscle gain. Both powders already deliver fast-digesting, leucine-rich whey. For most recreational lifters, total daily protein and training are more important than paying extra for hydrolysis alone.
How should I compare the prices of ISO100 and Gold Standard?
Use cost per 30 grams of protein: tub price divided by total protein grams in the tub, multiplied by 30. Do not compare tub price or scoop price alone because container sizes, servings, scoop weights, and protein grams differ.
Do ISO100 and Gold Standard contain artificial sweeteners?
The reviewed U.S. Strawberry labels both list sucralose. ISO100 Strawberry also lists steviol glycosides, while Gold Standard Delicious Strawberry lists flavoring and coloring ingredients in addition to its whey blend. Ingredients vary by flavor and market, so read the exact label you are buying.
Bottom line
Choose Dymatize ISO100 when you want the denser isolate formula, slightly leaner reviewed macros, or a more cautious starting point for lactose sensitivity. Choose Optimum Nutrition Gold Standard when you tolerate a whey blend and its current cost per 30g protein is meaningfully lower. For building muscle, both are capable; your daily protein target, training, diet, sleep, tolerance, and consistency decide far more than the logo on the tub.
Continue comparing
Best Whey Protein PowderUse the full whey buying methodology.Whey Isolate vs ConcentrateUnderstand the formula difference.Protein Powder ComparisonCompare whey, casein, plant, egg, and collagen.Protein Powder FinderChoose a powder type by goal and tolerance.Protein Score CalculatorNormalize current labels and prices.Protein CalculatorSet your daily protein target first.