Optimum Nutrition Gold Standard 100% Casein 1.82kg vs Diet Protein Strawberry Milkshake 450g (18 Servings)
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Optimum Nutrition Gold Standard 100% Casein 1.82kg and Diet Protein Strawberry Milkshake 450g (18 Servings).
Last verified: 07 Apr 2026 · Based on 16 reviews
Optimum Nutrition Gold Standard 100% Casein 1.82kg scores 76.0/100 vs Diet Protein Strawberry Milkshake 450g (18 Servings) at 70.0/100. Optimum Nutrition Gold Standard 100% Casein 1.82kg wins on certifications. Diet Protein Strawberry Milkshake 450g (18 Servings) is stronger on ingredient quality and value for money.
Which is better: Optimum Nutrition Gold Stan... or Diet Protein Strawberry Mil...?
Applied Nutrition Diet Protein wins on value at £15.00 versus £67.95, delivering comparable effectiveness (both score 80/100) at a fraction of the cost. Competitive athletes who require Informed Choice certification for banned substance testing should choose the Optimum Nutrition Casein instead.
— AIScored Editorial Team
How Do the Scores Compare?
Optimum Nutrition Gold Stan...
Optimum Nutrition
|
Diet Protein Strawberry Mil...
Applied Nutrition
|
|
|---|---|---|
| Overall Score | 76.0 | 70.0 |
| Effectiveness |
80.0/100
Best
|
80.0/100
Best
|
| Ingredient Quality | 67.0/100 |
70.0/100
Best
|
| Value for Money | 74.0/100 |
80.0/100
Best
|
| Side Effects | 72.0/100 |
80.0/100
Best
|
| Certifications |
85.0/100
Best
|
30.0/100 |
| Best Price | £67.95 Amazon UK → |
£15.00
Holland & Barrett →
Cheapest
|
| Price per Serving | £1.24 55 servings | N/A |
| Form | Powder | None |
| Dose | 24g protein per 33g serving | None |
| Third-Party Tested | ✓ Yes | ✗ No |
| Reviews Analysed | 12 | 4 |
Optimum Nutrition Gold Standard ...
Pros
- ✓Micellar casein delivers a sustained, slow amino acid release over 5–7 hours — well-suited for overnight recovery
- ✓Solid nutritional profile: 24g protein, 4.7g BCAAs, and 4.8g glutamine per 33g serving at only 120 kcal
- ✓Informed Choice certified — independently tested for banned substances, important for competitive athletes
- ✓Optimum Nutrition is one of the most established and consistently trusted brands in sports nutrition globally
Cons
- ✗Contains four thickening agents (cellulose gum, carrageenan, guar gum, xanthan gum) — a more complex additive profile than cleaner casein alternatives
- ✗Carrageenan is a contested ingredient; while FDA-classified as GRAS, some research raises concerns about gut inflammation in sensitive individuals
- ✗Artificial sweeteners (sucralose and acesulfame potassium) may be undesirable for users preferring naturally sweetened products
- ✗Customer service complaints noted — at least one user reported dismissive and unprofessional support from ON's team
Best For
Diet Protein Strawberry Milkshak...
Pros
- ✓Excellent taste and palatability (all 4 reviewers mentioned flavor positively)
- ✓Mixes easily without clumping (explicitly noted by reviewers)
- ✓High protein content at 20g per serving with 4g+ BCAAs for muscle recovery
- ✓Suitable for users with ingredient sensitivities or allergies to major brands
Cons
- ✗No third-party testing or certifications (affects ingredient verification and purity claims)
- ✗Weight management ingredients (CLA, L-Carnitine) have modest evidence for fat loss at typical supplement doses
- ✗Product is not vegan, limiting appeal to plant-based dieters
- ✗Limited review data (only 4 reviews) restricts confidence in consistency claims
Best For
What does the data say about Optimum Nutrition Gold... vs Diet Protein Strawberr...?
Optimum Nutrition Gold Standard 100% Casein provides a slow release of amino acids for up to seven hours. This makes it ideal for overnight recovery. Each 33g scoop gives you 24g of protein and 4.7g of BCAAs. Applied Nutrition Diet Protein Strawberry Milkshake offers 20g of protein per serving but includes CLA and L-Carnitine. While both products score 80.0/100 for effectiveness, Applied Nutrition Diet Protein Strawberry Milkshake wins on ingredient quality with 70/100. The Optimum Nutrition powder scores 67/100 because it uses four different thickeners.
Competitive athletes and bodybuilders should choose Optimum Nutrition Gold Standard 100% Casein. It is Informed Choice certified and tested for banned substances. It costs £67.95 for a large tub. If you have a smaller budget, Applied Nutrition Diet Protein Strawberry Milkshake is £15.00 and scores 80/100 for value. This beats the 74/100 value score for the casein powder. It is a better fit for people with sensitivities to major brands or those who want a tasty meal replacement.
Applied Nutrition Diet Protein Strawberry Milkshake mixes easily without clumping. Every reviewer liked the flavour. Optimum Nutrition Gold Standard 100% Casein contains carrageenan, which might cause gut issues for some users. It also includes xanthan gum and cellulose gum. Optimum Nutrition Gold Standard 100% Casein has an overall score of 76.0/100, while Applied Nutrition Diet Protein Strawberry Milkshake sits at 70.0/100.
Optimum Nutrition Gold Standard 100% Casein is a benchmark slow-digesting protein powder built around micellar casein, widely used as a pre-sleep supplement to support overnight muscle recovery and protein synthesis.
What are the key differences?
Frequently Asked Questions
Which is better, Optimum Nutrition Gold Standard 100% Casein 1.82kg or Diet Protein Strawberry Milkshake 450g (18 Servings)? ▼
Is Optimum Nutrition Gold Standard 100% Casein 1.82kg worth the price compared to Diet Protein Strawberry Milkshake 450g (18 Servings)? ▼
Which has fewer side effects? ▼
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Disclaimer: AIScored provides data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.
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