Optimum Nutrition Gold Standard 100% Casein 1.82kg vs Diet Protein Salted Caramel 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 Salted Caramel 450g (18 Servings).

Last verified: 07 Apr 2026 · Based on 16 reviews

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76.0

Quick Answer

Optimum Nutrition Gold Standard 100% Casein 1.82kg scores 76.0/100 vs Diet Protein Salted Caramel 450g (18 Servings) at 70.0/100. Optimum Nutrition Gold Standard 100% Casein 1.82kg wins on effectiveness, certifications. Diet Protein Salted Caramel 450g (18 Servings) is stronger on ingredient quality and value for money.

Which is better: Optimum Nutrition Gold Stan... or Diet Protein Salted Caramel...?

Optimum Nutrition wins with a higher score (76 vs 70) and Informed Choice certification, making it the better pick for competitive athletes who need verified purity. Applied Nutrition suits budget-conscious gym-goers — at £15 for 18 servings it costs a fraction of the price, delivering decent protein with a crowd-pleasing flavour.

— AIScored Editorial Team

How Do the Scores Compare?

Optimum Nutrition Gold Stan...

Diet Protein Salted Caramel...

	Optimum Nutrition Gold Stan... Optimum Nutrition	Diet Protein Salted Caramel... Applied Nutrition
Overall Score	76.0	70.0
Effectiveness	80.0/100 Best	70.0/100
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	40.0/100
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

Athletes and bodybuilders seeking overnight muscle recovery support Gym-goers who train in the evening and want sustained pre-sleep protein Competitive athletes who require third-party tested, certified supplements Those in a caloric deficit needing high-protein, low-calorie intake Users who prioritise established brand reliability over minimal-additive formulas

Amazon UK £67.95

View full review →

Diet Protein Salted Caramel 450g...

Pros

✓Pleasant salted caramel flavor with no chalky residue (consistent user feedback)
✓Mixes well in water or milk
✓Good value for price at £0.45–0.50 per serving (450g pack)
✓20g protein + 4g+ BCAAs per serving supports muscle maintenance

Cons

✗Not third-party tested (no independent verification of label claims or purity)
✗Not vegan (whey-based; excludes plant-based dieters)
✗Limited review sample (4 reviews) provides insufficient feedback on side effects, mixability edge cases, or long-term satisfaction
✗CLA, L-Carnitine, and Green Tea efficacy for weight management is modest in research; not a substitute for diet/exercise

Best For

Active individuals and athletes seeking affordable, convenient post-workout protein Those prioritizing taste and mixability over premium certifications Budget-conscious gym-goers wanting a protein + weight-management ingredient combination People comfortable with whey-based (non-vegan) supplements

Holland & Barrett £15.00

View full review →

What does the data say about Optimum Nutrition Gold... vs Diet Protein Salted Ca...?

Optimum Nutrition Gold Standard 100% Casein delivers a sustained, slow amino acid release for up to seven hours. This makes it a specific tool for overnight muscle recovery. Each 33g serving contains 24g of protein and 4.8g of glutamine. Applied Nutrition Diet Protein Salted Caramel is a whey-based powder that focuses on weight management. It scores 70.0/100 for ingredient quality, which is higher than the 67.0/100 score for the casein. The Optimum Nutrition formula uses four thickeners including carrageenan. Some research suggests this ingredient causes gut inflammation in sensitive people.

Competitive athletes should buy Optimum Nutrition Gold Standard 100% Casein because it is Informed Choice certified. It costs £67.95 for 1.82kg and scores 80.0/100 for effectiveness. If you need a cheaper option, Applied Nutrition Diet Protein Salted Caramel costs £15.00. It wins on value with a score of 80.0/100. This powder is for gym-goers who want a pleasant taste without any chalky residue. It mixes easily in water or milk. It is not vegan and lacks third-party testing. Optimum Nutrition Gold Standard 100% Casein has an overall score of 76.0/100 compared to 70.0/100 for the Applied Nutrition powder.

Optimum Nutrition Gold Standard 100% Casein 1.82kg Winner 76.0/100

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.

Effectiveness

Optimum Nutritio..

80.0/100

Diet Protein Sal..

70.0/100

Ingredient Quality

Optimum Nutritio..

67.0/100

Diet Protein Sal..

70.0/100

Value for Money

Optimum Nutritio..

74.0/100

Diet Protein Sal..

80.0/100

Side Effects

Optimum Nutritio..

72.0/100

Diet Protein Sal..

80.0/100

Certifications

Optimum Nutritio..

85.0/100

Diet Protein Sal..

40.0/100

What are the key differences?

Optimum Nutrition Gold .. is best for: Athletes and bodybuilders seeking overnight muscle recovery support, Gym-goers who train in the evening and want sustained pre-sleep protein

Diet Protein Salted Car.. is best for: Active individuals and athletes seeking affordable, convenient post-workout protein, Those prioritizing taste and mixability over premium certifications

Frequently Asked Questions

Which is better, Optimum Nutrition Gold Standard 100% Casein 1.82kg or Diet Protein Salted Caramel 450g (18 Servings)? ▼

Optimum Nutrition Gold Standard 100% Casein 1.82kg scores 76.0/100 overall while Diet Protein Salted Caramel 450g (18 Servings) scores 70.0/100. Optimum Nutrition Gold Standard 100% Casein 1.82kg comes out ahead, scoring higher on effectiveness (80.0 vs 70.0). Optimum Nutrition Gold Standar is best suited for Athletes and bodybuilders seeking overnight muscle recovery support and Gym-goers who train in the evening and want sustained pre-sleep protein. Diet Protein Salted Caramel 45 is better for Active individuals and athletes seeking affordable, convenient post-workout protein and Those prioritizing taste and mixability over premium certifications.

Is Optimum Nutrition Gold Standard 100% Casein 1.82kg worth the price compared to Diet Protein Salted Caramel 450g (18 Servings)? ▼

Optimum Nutrition Gold Standard 100% Casein 1.82kg costs £67.95 while Diet Protein Salted Caramel 450g (18 Servings) is £15.00. For value, Optimum Nutrition Gold Standard 100% Casein 1.82kg scores 74.0/100 vs Diet Protein Salted Caramel 450g (18 Servings)'s 80.0/100. Diet Protein Salted Caramel 450g (18 Servings) delivers better value relative to its quality.

Which has fewer side effects? ▼

Optimum Nutrition Gold Standard 100% Casein 1.82kg scores 72.0/100 for side effects (higher means fewer reported issues) while Diet Protein Salted Caramel 450g (18 Servings) scores 80.0/100. Reviewers report fewer side effects with Diet Protein Salted Caramel 450g (18 Servings). For certification and testing, Optimum Nutrition Go scores 85.0/100 vs Diet Protein Salted 's 40.0/100. Always consult a healthcare professional before starting any supplement.

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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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