Contents 10 sections
- Who is behind Optimum Nutrition
- Optimum Nutrition wheys under the microscope
- What the reference YouTube video says
- What customers say
- Optimum Nutrition discount code
- ⭐ Our rating of Optimum Nutrition
- Optimum Nutrition or Nutripure
- Who is it for? Who is it not for
- Our verdict on Optimum Nutrition
- Frequently asked questions
What is your main goal?
How do you digest dairy?
What matters most to you?
Summarise this article with:
💡 The essentials
- Optimum Nutrition is an American brand founded in 1986, known for Gold Standard 100% Whey, one of the best-selling wheys in the world. Its factories are certified LGC Informed Choice, NSF and BRCGS.
- Gold Standard is a hybrid whey: a blend of isolate, concentrate and hydrolysed isolate, with 24 g of protein per serving, or 74 to 80 g per 100 g depending on the flavour.
- It is not cheap: about $75 per kilo of protein in the 2.26 kg tub, and up to $107 in the small tub, at the prices read on optimumnutrition.com on 31 October 2026.
- Reviews are very split: 4.9 out of 5 on the brand’s site (2,293 reviews of Gold Standard), but 1.9 out of 5 on Trustpilot (196 reviews), mostly over customer service.
- Our verdict: a safe bet, but neither the cleanest nor the cheapest. For a sweetener-free isolate made from French milk, Nutripure Whey Isolate Native remains our first choice.
Optimum Nutrition is the black tub with a red band you have seen in every gym for twenty years. But does Gold Standard still deserve its reputation in 2026, and at what price? We read the labels, the official site’s prices and the customer reviews to answer you.
🔬 Our method
This review is based on the official product pages of optimumnutrition.com (ingredients, nutrition facts, euro prices), its quality page, its offers page and Trustpilot, all read on 31 October 2026. The European site bills in euros: dollar prices are converted at the European Central Bank rate of 30 October 2026 (1 € = $1.1172). We do not run lab tests and we do not taste the products: we compare labels and prices per kilo of protein, with the same grid as every brand on the site.
🏭 Who is behind Optimum Nutrition?
Optimum Nutrition was founded in 1986 in the United States and now belongs to the Irish group Glanbia, which also owns BSN and Isopure. In Europe, the brand sells direct on optimumnutrition.com and through many retailers (Decathlon, Amazon, Zumub…).
Its main argument is manufacturing quality: the brand says its factories are certified LGC Informed Choice (screening for banned substances), NSF, ISO and BRCGS, and claims more than 100,000 quality checks a year. On the other hand, it does not state where the milk in its wheys comes from. To place it against the others, read our ranking of the best whey protein brands.
🥛 Optimum Nutrition wheys under the microscope
Gold Standard 100% Whey, the benchmark
| Criterion | Gold Standard 100% Whey (Double Rich Chocolate) |
|---|---|
| Protein per serving | 24 g (31 g serving) |
| Protein per 100 g | 76 g in chocolate, 79 g in vanilla, 80 g unflavoured |
| Ingredients | Whey protein blend 93% (isolate, concentrate, hydrolysed isolate, soy lecithin), fat-reduced cocoa, flavourings, xanthan gum |
| Sweeteners | Sucralose and acesulfame K (except the unflavoured version) |
| Price | $37.97 (450 g) to $128.47 (2.26 kg) |
| Price per kilo of protein | about $75 (2.26 kg) to $107 (450 g) |
It is a hybrid whey, between isolate and concentrate: isolate comes first in the ingredient list, which explains a decent protein content for a flavoured whey. The price depends hugely on the size: the small 450 g tub works out at about $107 per kilo of protein, the 2.26 kg tub at about $75. On the official site, it is rated 4.9 out of 5 (2,293 reviews), with complaints about the price.
Gold Standard 100% Isolate, the highest in protein
The isolate shows 25 g of protein per 30 g serving, or 83 g per 100 g, with a 94 to 95% blend of isolate and hydrolysed isolate and sucralose as the only sweetener. It costs $36.86 for 450 g and $68.14 for 930 g, or about $88 to $99 per kilo of protein. Rated 4.9 out of 5 on 355 reviews, it is dearer than most isolates in our guide to the best whey isolate.
Serious Mass and Platinum Hydrowhey
Serious Mass is the brand’s mass gainer: 1,262 kcal and 50 g of protein in a 336 g serving, but only 15 g of protein per 100 g, with maltodextrin as the first ingredient. We compare it with in-store gainers on our Decathlon mass gainer page. Platinum Hydrowhey is its hydrolysed whey, at $115.06 for 1.6 kg (about $90 per kilo of protein). To know whether hydrolysate is worth the price, read our guide to hydrolyzed whey protein.
🎥 What the reference YouTube video says
The most-watched French review of Gold Standard is Sharefitness’s (about 65,000 views, March 2014), presented by Pask. It is old, so we checked each of its points against today’s label.
- “24 g of protein per 30 g serving”: still true, at 24 g per 30 to 32 g serving depending on the flavour.
- “78.5 g of protein per 100 g in chocolate, 80 to 81 g in other flavours”: a little lower today, 76 g in Double Rich Chocolate, 79 g in vanilla and 80 g unflavoured.
- “Isolate as the first ingredient, then concentrate”: still true, now with hydrolysed isolate as well.
- “Soy lecithin”: still there, as an emulsifier.
- “4 g of glutamine per serving”: today’s Gold Standard page no longer claims it. It appears on the isolate’s page (4.3 g of glutamine and glutamic acid).
- Mixes well, no lumps, good taste: that is a tasting impression we cannot check on a label.
Our reading: the video is still right about the recipe, but its protein figures are slightly better than those of the tub sold in 2026. You can watch it on YouTube (Sharefitness).
💬 What customers say
On the brand’s site, Gold Standard is rated 4.9 out of 5 (2,293 reviews) and the site shows 4.7 on more than 11,000 reviews across all ranges. Complaints are mainly about price and the lack of a loyalty programme. On Trustpilot, it is the opposite: 1.9 out of 5 on 196 reviews (read on 31 October 2026), with complaints about deliveries and customer service, and Trustpilot notes that the brand does not invite its customers to review there. The product pleases, the online shop much less.
🏷️ Optimum Nutrition discount code
The official site publishes its offers on a dedicated page. On 31 October 2026: 15% off a selection of proteins, 30% off creatine, Gold Standard packs at 15% off, and 15% off the first order when you sign up to the newsletter. We detail everything, with the price per kilo of protein after discount, on our Optimum Nutrition discount code page. Note that Zumub’s ZUMBIE code excludes Optimum Nutrition (see our Zumub discount code).
⭐ Our rating of Optimum Nutrition
| Criterion | Rating |
|---|---|
| Price per kilo of protein | ★★★☆☆ |
| Protein content | ★★★★☆ |
| Short recipe, few additives | ★★★☆☆ |
| Manufacturing quality (certifications) | ★★★★★ |
| Transparency (milk origin) | ★★☆☆☆ |
| Customer reviews | ★★★☆☆ |
⚖️ Optimum Nutrition or Nutripure?
| Criterion | Gold Standard 100% Isolate (chocolate) | Nutripure Whey Isolate Native (unflavoured) |
|---|---|---|
| Protein per 100 g | 83 g | 86.8 g |
| Additives | Soy lecithin, cocoa, flavourings | Sunflower lecithin only |
| Sweetener | Sucralose | None |
| Milk origin | Not stated | France |
| Price on 31/10/2026 | $36.86 (450 g) to $68.14 (930 g) | $50.16 (750 g) to $212.16 (4 kg) |
| Price per kilo of protein | about $88 to $99 | about $61 to $77 |
On price, Nutripure clearly wins: about $11 to $27 less per kilo of protein than the Optimum Nutrition isolate, and even slightly less than Gold Standard in the big tub. On the recipe, Nutripure also comes first: more protein per 100 g, no sweetener and French milk. Optimum Nutrition keeps the edge on flavours and anti-doping certification, useful if you compete.
✅ Who is it for? ❌ Who is it not for?
- For you if you compete and want a whey tested for banned substances (Informed Choice certification).
- For you if you want a well-known flavoured whey with a wide choice of flavours, and you buy it in a big tub or during an offer.
- Not for you if you want to avoid sucralose: take the unflavoured version, or a plain whey.
- Not for you if you want to know where the milk comes from: pick one of the wheys in our guide to the best French whey protein.
🏁 Our verdict on Optimum Nutrition
Optimum Nutrition sells a serious, well-controlled whey, and Gold Standard remains a safe bet if you want a flavoured whey with no surprises. Its weak points are the price of small sizes, the sweeteners and the vagueness about milk origin. If you want the best recipe at the best price, Nutripure Whey Isolate Native is our first choice.
⚠️ Warning
Whey supplements your diet, it does not replace a meal. If you have a milk protein or soy allergy, are pregnant or have kidney disease, ask your doctor before taking it. For the right dose, read how much whey protein per day.
❓ Frequently asked questions
Is Optimum Nutrition a good brand?
Yes for manufacturing quality, less so for price: its factories are certified Informed Choice, NSF and BRCGS, but its whey costs about $75 to $107 per kilo of protein depending on the size, and the brand does not state where its milk comes from.
Is Gold Standard an isolate?
No, it is a blend of isolate, concentrate and hydrolysed isolate. Optimum Nutrition sells a true isolate separately, Gold Standard 100% Isolate (83 g of protein per 100 g).
How much protein is in a serving of Gold Standard?
24 g per serving of 30 to 32 g depending on the flavour, or 74 to 80 g per 100 g according to the labels of 31 October 2026.
Does Optimum Nutrition whey contain sweeteners?
Yes, the flavoured versions contain sucralose, plus acesulfame K for Gold Standard. The unflavoured version contains none.
Where can I buy Optimum Nutrition whey for less?
On the official site during its offers, or in packs of big tubs. All current offers are on our Optimum Nutrition discount code page.
