Whey isolate · per 25 g protein
Optimum Nutrition vs Transparent Labs whey isolate
Transparent Labs costs 26% less per 25 g protein than Optimum Nutrition: $1.73 vs $2.35. At one serving a day that is $632.18 a year instead of $858.48, $226.30 less.
Popular brand
Optimum Nutrition
Gold Standard 100% Isolate Whey Protein powder · Chocolate Bliss · 44 Servings
- Per serving
- $2.35 per 25 g protein
- A year, one serving a day
- $858.48
- Container
- $103.49 at Optimum Nutrition
No. 1 cheapest on our list26% less
Transparent Labs
Grass-Fed Whey Protein Isolate · 4LB · Unflavored
- Per serving
- $1.73 per 25 g protein
- A year, one serving a day
- $632.18
- Container
- $109.99 at Transparent Labs
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Side by side
| Detail | Optimum Nutrition | Transparent Labs |
|---|---|---|
| Price per 25 g protein | $2.35 | $1.73 |
| A year, one serving a day | $858.48 | $632.18 |
| Container price | $103.49 at Optimum Nutrition | $109.99 at Transparent Labs |
| In the container | 1100g protein | 1587.3g protein |
| Servings of 25 g protein | 44 | 63.5 |
| Serving on the label | 25 g protein | 28 g protein |
| Form | Powder | Powder |
| Third-party testing | Not listed | NSF Certified for Sport (opens in a new tab) |
| Price checked | Every day | Every day |
Tested means the product is in the testing program's own database (NSF, USP, Informed Sport or Choice, IFOS). Not listed means we didn't find it there, not that it failed a test.
The verdict
Transparent Labs costs 26% less per 25 g protein than Optimum Nutrition: $1.73 vs $2.35. At one serving a day that is $632.18 a year instead of $858.48, $226.30 less.
Transparent Labs is listed by NSF Certified for Sport. We didn't find Optimum Nutrition in a testing program's database.
Transparent Labs costs more at checkout ($109.99 vs $103.49) because the container holds more: 63.5 servings of 25 g protein against 44.
The labels use different servings (Optimum Nutrition: 25 g protein, Transparent Labs: 28 g protein), so both are priced on the same 25 g protein.
We compare price on the same dose. Taste, mixing, other ingredients and how a product suits you are yours to judge, so read both labels before you switch.
The cheapest whey isolate today
Top pick. Lowest price per serving among third-party tested products.
Transparent Labs Grass-Fed Whey Protein Isolate · 4LB · UnflavoredNSF Certified for Sport (opens in a new tab)Checked less than an hour ago
$1.73 per 25 g protein26% less than Optimum Nutrition per 25 g protein
BuySave me money at Transparent Labs (opens in a new tab)- Muscle Feast Whey Protein Isolate, Pasture Raised, Grass Fed, rBST/rBGH and soy free · 5lb · Unflavored
Checked less than an hour ago
$1.78 per 25 g protein24% less than Optimum Nutrition per 25 g protein
BuySave me money at Muscle Feast (opens in a new tab) - Jacked Factory Authentic Iso, Whey Protein Isolate · 25 Servings · Vanilla Oatmeal Cookie
Checked less than an hour ago
$1.80 per 25 g protein23% less than Optimum Nutrition per 25 g protein
BuySave me money at Jacked Factory (opens in a new tab)
Cheaper alternatives to Optimum Nutrition whey isolateSee the full whey isolate list
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Questions
Is Transparent Labs cheaper than Optimum Nutrition?
Transparent Labs costs 26% less per 25 g protein than Optimum Nutrition: $1.73 vs $2.35. Both prices are checked every day, and this page changes when they do.
Are Optimum Nutrition and Transparent Labs the same whey isolate?
Both are on our whey isolate list: Optimum Nutrition as powder, Transparent Labs as powder. We compare the labeled amount of the active ingredient, priced per 25 g protein, not taste, other ingredients or quality. Prices shown per 25 g of protein, not scoop weight. Powder only. Blends and concentrates stay off this list.
Is Optimum Nutrition or Transparent Labs third-party tested?
Transparent Labs is listed by NSF Certified for Sport. We didn't find Optimum Nutrition in a testing program's database.
How is the price per 25 g protein worked out?
We divide the container price by how many 25 g protein servings the label's amount makes. Optimum Nutrition: $103.49 ÷ 44 servings of 25 g protein. Transparent Labs: $109.99 ÷ 63.5 servings of 25 g protein. Store prices can change at checkout.
More whey isolate head-to-heads
- Dymatize vs Transparent Labs whey isolateTransparent Labs costs 38% less per 25 g protein than Dymatize: $1.73 vs $2.81.
Whey isolate buying guides
- Best whey protein isolate 2026: cost per 25 g proteinThe best-value whey isolates right now, ranked by what you pay for 25 g of protein rather than per scoop or per tub, plus how to spot a blend sold as isolate.
- Whey isolate vs concentrate: is isolate worth it? Price per 25 g proteinIsolate is at least 90% protein with very little lactose; concentrate is cheaper and fine for many people. Compare tubs by cost per 25 g of protein.
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