Bulk Informed Mass vs Optimum Serious Mass Choc Peanut Butter
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Bulk Informed Mass and Optimum Serious Mass Choc Peanut Butter.
Last verified: 01 Mar 2026 · Based on 18 reviews
Our Verdict: Bulk Informed Mass or Optimum Serious Mass Choc Peanut Butter?
Bulk Informed Mass edges ahead with a higher overall score (77 vs 70) thanks to cleaner ingredients — oat-based carbs, Informed Sport certification, and added HMB set it apart for drug-tested athletes. At just £5 more, it's the better pick for those prioritising ingredient quality. Opt for Optimum Nutrition's Serious Mass if raw calorie density and budget are your priorities, as its 1,263 kcal per serving and lower price suit pure hard gainers less concerned with sugar content.
— AIScored Editorial Team
Bulk Informed Mass scores 77.0/100 vs Optimum Serious Mass Choc Peanut Butter at 70.0/100. Bulk Informed Mass wins on ingredient quality, side effects, certifications. Optimum Serious Mass Choc Peanut Butter is stronger on effectiveness and value for money.
Bulk Informed Mass vs Optimum Serious Mass Choc Peanut Butter: What Does the Data Say?
Informed Mass and Serious Mass target hard gainers but differ sharply in approach. Informed Mass (£45, 77/100 score) uses oat flour instead of maltodextrin, delivering 45g protein with creatine and HMB per serving—a cleaner formula with an ingredient quality score of 83/100. Serious Mass (£40, 70/100 score) prioritises calories: 50g protein and 1,263 kcal per serving, but with 26g sugar and 1.56g sodium—substantial amounts if either concerns you. Pick Informed Mass if you're a competitive athlete wanting clean formulation and already own a blender. Choose Serious Mass if maximum calories and value matter most, and you're comfortable with the sugar intake.
The practical difference is mixing. Serious Mass is simpler to prepare but thick and unpleasant for some. Informed Mass requires a blender—reviewers reported clumping and gritty texture in a shaker alone. Neither has third-party testing. Informed Mass's strength lies in ingredient quality; Serious Mass excels in value (80/100) and calorie delivery (effectiveness 80/100 vs 72/100). If sodium sensitivity is an issue, Serious Mass's 26% RDA per serving may be a problem.
How Do the Scores Compare?
Informed Mass, Strawberries...
Bulk
|
Serious Mass Chocolate Pean...
Optimum Nutrition
|
|
|---|---|---|
| Overall Score | 77.0 | 70.0 |
| Effectiveness | 72.0/100 |
80.0/100
Best
|
| Ingredient Quality |
83.0/100
Best
|
70.0/100 |
| Value for Money | 76.0/100 |
80.0/100
Best
|
| Side Effects |
78.0/100
Best
|
70.0/100 |
| Certifications |
85.0/100
Best
|
50.0/100 |
| Best Price | £45.00 Amazon UK → |
£36.00
Holland & Barrett →
Cheapest
|
| Price per Serving | £2.25 20 servings | N/A |
| Form | Powder | powder |
| Dose | 45g protein, 550+ kcal per serving | None |
| Third-Party Tested | ✗ No | ✗ No |
| Reviews Analysed | 14 | 4 |
Informed Mass, Strawberries and ...
Pros
- ✓No maltodextrin — oat flour provides complex carbs with a lower glycaemic impact, widely praised by reviewers
- ✓Informed Sport certified, providing reliable banned-substance assurance for competitive athletes
- ✓Added creatine monohydrate (3g) and HMB (1.5g) add meaningful ergogenic value beyond a standard gainer
- ✓Generally well-tolerated, with DigeZyme enzyme blend supporting digestion of the large serving size
Cons
- ✗Mixes poorly in a shaker without a blender — clumping and undissolved particles reported by multiple reviewers
- ✗Thick, heavy texture is polarising; some users found it unpleasant to drink
- ✗Only 20 servings per 3kg bag — serving size (150g) is large and the bag depletes quickly
- ✗Taste described as average to decent across flavours; some find it overly saline or requiring large water volume
Best For
Serious Mass Chocolate Peanut Bu...
Pros
- ✓Extremely high calorie density (1,263 kcal/serving) designed specifically for muscle gain
- ✓Substantial protein content (50g per serving) with dual whey/casein blend for sustained release
- ✓Added creatine monohydrate (3g/serving) supports strength and performance
- ✓Complete micronutrient profile with 25 vitamins and minerals at therapeutic doses
Cons
- ✗Very high sugar content (26g per serving) unsuitable for those managing blood glucose
- ✗High sodium per serving (1.56g, 26% RDA) may concern sodium-sensitive individuals
- ✗Large serving size (334g powder + 710ml water) makes it inconvenient for on-the-go use
- ✗Contains multiple allergens: milk, soy, wheat, egg; not suitable for allergic individuals
Best For
Score Breakdown: Bulk Informed Mass vs Optimum Serious Mass Choc Peanut Butter
Bulk's Informed Mass is a premium lean mass gainer built around a tri-protein blend (whey concentrate, isolate, and casein) delivering 45g protein and 550+ kcal per serving from oat flour rather than maltodextrin — a distinction repeatedly praised by reviewers.
What are the key differences?
Frequently Asked Questions
Which is better, Bulk Informed Mass or Optimum Serious Mass Choc Peanut Butter? ▼
Is Bulk Informed Mass worth the price compared to Optimum Serious Mass Choc Peanut Butter? ▼
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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