1 / 7Optimum Nutrition Gold Standard Casein Protein Powder, Creamy Vanilla, 28 Servings
Servings: Optimum Nutrition Gold Standard Casein is a slow-digesting casein protein powder in Creamy Vanilla. The listing describes micellar casein with zinc and magnesium, suited to buyers seeking a slower-release shake, including before bed. Its listed scoop mixes with cold water, while customer feedback is mixed on sweetness, texture and ease of mixing.
At a glance
- Listing describes 24 g of micellar casein protein per serving and a slow, steady supply of amino acids.
- Contains zinc and magnesium, with the listing describing zinc as contributing to a healthy immune system and magnesium supporting normal protein synthesis.
- Instructions give one heaped scoop mixed with cold water or another preferred beverage. The listed water amounts vary across the page.
- The tub may appear partly filled because the listing says the powder settles during vacuum packing.
Reference price: £42.12
Price checked: 12 Nov 2026
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Pros and cons
Pros
- A casein-based, slow-digesting option for buyers who want protein between meals or before bed.
- Listing specifies 28 servings and 24 g of micellar casein per serving.
- Gluten-free claim and explicit milk allergen information help buyers check dietary suitability.
Cons
- Contains milk, so it is unsuitable for people avoiding milk ingredients.
- Customer feedback is mixed about the taste and mixing, with reports of excessive sweetness and clumping or poor dissolution.
Technical specifications
18 specifications| Brand | Optimum Nutrition |
|---|---|
| Model | Optimum Nutrition Gold Standard Casein Protein Powder |
| Protein source | Casein |
| Flavour | Vanilla |
| Diet type | Gluten Free |
| Allergen information | Contains: Milk |
| Caffeine | Caffeine Free |
| Recommended use | Post-Workout |
| Age range | Adult |
| Protein | 73 g |
|---|---|
| Vitamins and minerals | 1.4 g |
| Servings per container | 28 |
| Net content volume | 5.63 Litres |
| Items | 1 |
| Dimensions listed | 20.5 x 20.5 x 28.4 centimetres |
|---|---|
| Weight listed | 1.81 Pounds |
| Package type | Tub |
| Country of origin | United Kingdom |
What to know before buying
Listing details to confirm
The listing contains inconsistent quantity details: the title says 0.92 kg, the unit count says 920.0 gram, and the weight field says 1.81 Pounds. Protein also differs between a details field of 73 g and feature and description claims of 24 g per serving. Water instructions vary between 300 ml, 300-360 ml and 300 to 350 ml. Confirm the selected tub's label for serving nutrition, net quantity and preparation directions. Packaging may vary, and the page marks the product as discontinued by the manufacturer, so current formulation and packaging are unconfirmed.
Who is it for?
A good fit for
- People looking for a casein protein shake for use before bed or between meals.
- Buyers who want a vanilla-flavoured powder and are comfortable with a milk-derived protein.
Less suited to
- People avoiding milk or seeking a dairy-free protein.
- Buyers who need unambiguous nutrition and serving information without checking the selected tub label.
Customer reviews on Amazon
- 5 stars
70% 70% - 4 stars
13% 13% - 3 stars
8% 8% - 2 stars
1% 1% - 1 star
8% 8%
Customer feedback reports perceived effectiveness and digestive benefits, including feeling full overnight. Views are mixed on taste, mixability, ingredients and texture, with some finding it pleasant and easy to mix and others describing it as too sweet, thick or grainy. For buyers planning a bedtime shake, the reported satiety may matter, but the mixed mixing and texture experiences are worth considering. Aggregate ratings lean positive overall, while a notable lower-rating share means they do not remove those reservations.
Positive themes
- Customers mention effectiveness and digestive benefits, including feeling full through the night.
Negative themes
- Some customers report excessive sweetness, poor mixing, and a thick or grainy texture.
Mixed feedback
- Taste, mixability, ingredients and texture receive mixed feedback, including remarks about formula changes.
Frequently asked questions
How much protein does each serving provide?
The feature and description text state 24 g of micellar casein protein per serving, but a details field lists 73 g of protein without clarifying its basis. Check the selected tub label before relying on the amount.
How do you prepare it?
The listing suggests one heaped scoop with cold water, but gives differing amounts: 300 ml, 300-360 ml and 300 to 350 ml. Follow the directions on the tub you receive.
Does this contain milk?
Yes. The listing states “Contains: Milk” and identifies micellar casein as milk-derived.
Why might the tub look partly empty?
The listing says vacuum packing and settling can leave the tub appearing only partly full, without changing the labelled weight or serving count.
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Offer details
- Use as part of a varied, balanced diet and healthy lifestyle. The listing says not to use as a substitute for a varied diet or exceed the stated recommended daily dose.
- Reseal after use and store in a cool, dry place. Keep out of reach of young children.