Transparent Labs vs Optimum Nutrition Gold Standard Whey (2026)
Buy Optimum Nutrition Gold Standard 100% Whey. It costs $1.49 per 25 g of protein on Amazon, against $1.93 for Transparent Labs Grass-Fed Whey Isolate, and both are on Informed Choice. Pay more for Transparent Labs for all isolate (28 g of protein a scoop; Gold Standard has 24 g), stevia, or NSF Certified for Sport in a 30-serving tub.
By Erin Rose Updated October 25, 2026 Methodology
Transparent Labs
- Cost
- $1.93 per 25 g protein
- Testing
- NSF Certified for Sport, Informed Choice
Which should you buy?
- You want the most protein for your moneyGold Standard
$1.49 per 25 g of protein for Gold Standard, against $1.93 for Transparent Labs.
- You want the most protein in each scoopTransparent Labs
28 g of protein a scoop, against 24 g for Gold Standard.
- Regular whey upsets your stomachTransparent Labs
It is all whey isolate, which has most of the lactose filtered out. Gold Standard has some whey concentrate.
- You avoid artificial sweetenersTransparent Labs
It uses stevia. Gold Standard uses acesulfame potassium.
- Your sport requires NSF Certified for SportTransparent Labs
The 30-serving tub we link is on NSF’s list. Gold Standard’s 5 lb tub is not.
- You want Optimum Nutrition, but all isolateOptimum Nutrition Gold Standard Isolate
$2.05 per 25 g of protein on Amazon. Check the price.
- You want to build muscleEither
Both give at least 24 g of protein a scoop, so either does the job.
How we checked
- 2
- labels read, one per powder
- 2
- testing lists searched for each powder
- 2
- tubs priced on Amazon, November 6, 2026
- 2
- NSF listings read, one per brand
Which has more protein, and is it the same protein?
Transparent Labs has more protein a scoop: 28 g, against 24 g. Its scoop is bigger, too (34.3 g against 30.4 g). The real difference is the kind of whey. Transparent Labs is all whey isolate, from grass-fed cows. Gold Standard mixes isolate, concentrate and whey peptides.
| Per scoop | Gold Standard | Transparent Labs |
|---|---|---|
| Protein | 24 g | 28 g |
| Scoop | 30.4 g | 34.3 g |
| Protein share of the scoop | 79% | 82% |
| Calories | 120 | 130 |
| Fat | 1.5 g | 0.5 g |
| Carbs | 3 g | 1 g |
| Sugar | 1 g | 1 g |
| Protein from | Whey isolate, whey concentrate and whey peptides | Whey isolate only, from grass-fed cows |
| Sweetener | Acesulfame potassium | Stevia |
Which builds more muscle?
Neither, at the same protein. If you take 25 g of protein from either tub, the labels give no reason to expect a different result. How much you need a day: protein dosage guide.
Are both third-party tested?
Yes. Both are on Informed Choice, and only the Transparent Labs tub we link is also on NSF Certified for Sport.
- Both: Informed Choice. It lists both product lines. Informed Choice buys samples from stores and tests them for substances banned in sport.
- Transparent Labs: also NSF Certified for Sport, in the 30-serving French Vanilla tub we link. NSF tests lot by lot, so check the lot number on your tub against the listing.
- Gold Standard: NSF lists the 10 lb tub only. The 5 lb tub we link is not on that list.
Which is better if lactose bothers you?
Transparent Labs, because it is all whey isolate. Whey isolate has much less lactose (milk sugar) than whey concentrate. Gold Standard has some concentrate, but it adds lactase, the enzyme that breaks lactose down. Whey is a milk protein, so neither powder is safe for a milk allergy.
Which is the better value?
Gold Standard. Transparent Labs costs about 30% more per gram of protein.
On Amazon (November 6, 2026), Gold Standard’s 5 lb tub is $105.99 for 74 scoops of 24 g of protein: $1.49 per 25 g. Transparent Labs is $64.99 for 30 scoops of 28 g: $1.93 per 25 g. A scoop costs $2.17 for Transparent Labs and $1.43 for Gold Standard. At 25 g of protein a day, Transparent Labs costs about $13 more a month.
The big tub helps Gold Standard, but it wins at the same size too. Its 2 lb tub (29 scoops, $49.15) costs $1.77 per 25 g, still less than Transparent Labs.
Amazon prices move. Every protein powder we price, cheapest per 25 g first, is in protein powder prices.
More: our protein guide, the best protein powder, the best whey isolate, Gold Standard vs ISO100 and third-party tested protein powder.
Questions
Is Transparent Labs worth the extra cost?
Only if you need one of its differences: it is all whey isolate, it has more protein a scoop, it uses stevia, and the tub we link is on NSF Certified for Sport. Otherwise, Gold Standard gives you protein for less.
Which has fewer calories?
Gold Standard, by a little: 120 calories a scoop against 130 for Transparent Labs. Per gram of protein, Transparent Labs is a little lower: 4.6 calories against 5.0.
Is Gold Standard NSF Certified for Sport?
Only in the 10 lb tub. The 5 lb tub we link is not.
How we picked
We read both labels, searched Informed Choice and NSF Certified for Sport for each powder on October 1, 2026, and priced both tubs we link on Amazon on November 6, 2026. When both are on the same testing list, we pick the one that costs less per gram of protein.
Sources
- Labels: Transparent Labs Grass-Fed Whey Protein Isolate, French Vanilla, 30 servings (transparentlabs.com); Optimum Nutrition Gold Standard 100% Whey, Double Rich Chocolate, 5 lb (optimumnutrition.com). Read October 1, 2026.
- Testing: Informed Choice certified products; NSF Certified for Sport listings 1809884 (Transparent Labs French Vanilla, 1,029 g) and 1256427 (Gold Standard Double Rich Chocolate, 4.53 kg). Read October 1, 2026.