Whey and whey isolate comparison
Optimum Nutrition Gold Standard 100% Whey vs Myprotein Impact Whey Protein
ON Gold Standard Whey and Myprotein Impact Whey tie at 78/100 on our standard, with the same points on every criterion, so the label details below decide it. We could not verify a current price for Myprotein Impact Whey, so we can't compare cost.
Both are scored out of 100 against our published standard: protein density, third-party testing, label transparency, sugar, ingredient simplicity and verified label data. Every number below is from the manufacturer's label; last checked 2026-11-04.
Optimum Nutrition
Gold Standard 100% Whey
Myprotein
Impact Whey Protein
Side by side
Per serving, from each label. Bold marks the better score, protein density, sugar and cost where the two differ. How we score
| Compared | ON Gold Standard Whey | Myprotein Impact Whey |
|---|---|---|
| Our score | 78/100 | 78/100 |
| Protein density | 22 / 3077% of each scoop is protein | 22 / 3073% of each scoop is protein |
| Third-party testing | 15 / 25Independently tested for contaminants or label accuracy | 15 / 25Independently tested for contaminants or label accuracy |
| Label transparency | 20 / 20Fully disclosed formula, no amino spiking | 20 / 20Fully disclosed formula, no amino spiking |
| Sugar | 10 / 101 g sugar per serving | 10 / 101 g sugar per serving |
| Ingredient simplicity | 6 / 10Mix of natural and artificial flavors or sweeteners | 6 / 10Mix of natural and artificial flavors or sweeteners |
| Verified label data | 5 / 57 of 7 label values verified | 5 / 57 of 7 label values verified |
| Type | Whey Blend | Whey Concentrate |
| Protein per serving | 24 g | 22 g |
| Serving size | 31g (About 1 Scoop) | 1 scoop (30 g) |
| Protein by weight | 77% (better) | 73% |
| Sugar | 1 g | 1 g |
| Calories | 120 | 120 |
| Cost per 25 g protein | $1.86 | Not verified |
| Price per serving | $1.78 | Not verified |
| Third-party certifications | Informed Choice | Informed Choice, Informed Protein |
| Sweeteners | Acesulfame Potassium | Sucralose, Acesulfame Potassium, Stevia Leaf Extract |
| Allergens | Milk, Soy | Milk |
| Proprietary blend | No | No |
| Added free amino acids (amino spiking) | No | No |
| Last checked | 2026-10-13 | 2026-11-04 |
Which to choose
Only the differences in our records. A value we couldn't verify never counts as a difference.
Choose ON Gold Standard Whey if…
- You want more protein per serving (24 g vs 22 g).
- You want more of each scoop to be protein (77% vs 73% by weight).
- You want a powder the brand labels gluten-free (our record for Myprotein Impact Whey has no such label).
Choose Myprotein Impact Whey if…
- You avoid soy: ON Gold Standard Whey's label lists it as an allergen and Myprotein Impact Whey's does not.
The two powders
Good to know
Labels and prices change, so check the package before buying, especially if you have allergies. If you are pregnant, nursing, buying for a child or managing a health condition, ask your doctor before adding a supplement.