1 / 7Optimum Nutrition Gold Standard Casein Protein Powder, Chocolate, 28 Servings
Servings: Optimum Nutrition Gold Standard Casein is a chocolate-flavoured, slow-digesting protein powder with 24 g of micellar casein protein per serving, according to the listing. Its overnight-oriented use, alongside zinc and magnesium claims, may suit buyers seeking a casein option rather than a fast-digesting whey shake.
At a glance
- The listing describes micellar casein as slow-digesting and states 24 g protein per serving.
- Zinc and magnesium are listed as additions, with claims relating to immune system function and normal protein synthesis.
- Mixing directions vary across the listing. Water quantities range from 300 ml to 360 ml.
Reference price: £45.00
Price checked: 12 Nov 2026
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Pros and cons
Pros
- Casein provides a clearly differentiated, slow-digesting option for buyers seeking protein outside the fast-digesting whey category.
- The listing gives a specific 24 g protein-per-serving claim and 28 servings per container.
- The powder is described as caffeine-free.
Technical specifications
13 specifications| Brand | Optimum Nutrition |
|---|---|
| Model | Optimum Nutrition Gold Standard Casein Protein Powder |
| Flavour | Chocolate |
|---|---|
| Protein source | Casein |
| Protein per serving | 24 g, 74 g |
| Servings per container | 28 |
| Diet type | Keto |
| Caffeine-free claim | Caffeine Free |
| Allergen information | Contains: Egg may contain, Gluten may contain, Milk, Peanuts may contain, Soy may contain |
| Suggested use | Post-Workout |
| Dimensions listed | 20.5 x 20.5 x 28.4 centimetres |
|---|---|
| Weight listed | 850 Grams |
| Package type | Tub |
What to know before buying
Listing details to confirm
Listing details are inconsistent: the title states 0.92 kg and 28 servings, while product details list 850 Grams and 924.0 gram. The title says Chocolate Supreme while flavour details say Chocolate, and protein is listed as “24 g, 74 g” without explaining the second figure. Water amounts also differ across directions, so check the tub label and selected listing for the applicable details. The stated dimensions are listing figures, not independently verified measurements.
Who is it for?
A good fit for
- People looking specifically for a casein powder described as slow-digesting and suitable for overnight use.
- Buyers who want a chocolate-flavoured protein powder with a stated 24 g protein serving.
Less suited to
- People who need a clearly established net weight or unambiguous protein-per-serving specification before purchasing.
- Anyone avoiding milk or needing to avoid possible traces of egg, gluten, peanuts or soy.
Customer reviews on Amazon
- 5 stars
74% 74% - 4 stars
12% 12% - 3 stars
7% 7% - 2 stars
2% 2% - 1 star
5% 5%
Customer feedback reports positive impressions of taste, perceived effectiveness, quality and nutritional content, with some enjoying it as a night-time milkshake. Experiences are mixed on mixing, thickness and digestibility, including reports of difficulty mixing or nausea. For buyers using it as a night-time shake, those preparation and tolerance differences may matter alongside the listing’s slow-digesting casein claim. Aggregate ratings skew towards five-star, but ratings alone do not explain individual experiences.
Positive themes
- Customers mention the taste, quality and perceived effectiveness positively.
- Some feedback appreciates the nutritional content, including low carbohydrate and fat levels.
Mixed feedback
- Mixability and texture draw mixed reports, from creamy and easy to mix to thick and difficult to blend.
- Digestibility is mixed, with some reporting no stomach problems and others reporting nausea.
Frequently asked questions
How much protein does one serving provide?
The feature description states 24 g of micellar casein per serving, but another product-detail field lists “24 g, 74 g” without clarifying the second figure. Confirm the serving information on the selected pack.
How should it be mixed?
The supplied directions give differing amounts of water, from 300 ml to 360 ml. Follow the instructions on the tub you receive.
Does it contain allergens?
The listing identifies milk and says egg, gluten, peanuts and soy may be present. Review the actual packaging if you have an allergy or intolerance.
Is it intended for overnight use?
The product description presents its slow-digesting casein as an overnight protein option. This is a product-use claim, not a guarantee of a particular result.
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Offer details
- The listing advises using the powder as part of a varied, balanced diet and healthy lifestyle, not as a substitute for a varied diet. It also says not to exceed the recommended daily dose and to keep it out of reach of children.