5.5 /10
5.0 /10
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder vs Optimum Nutrition (ON) Serious Mass
Decode Label-scored on the concerns that matter for Supplement — the facts from each label, side by side. We decode, you decide.
Pack images are shown to identify the products. Decode Label is independent of Optimum Nutrition and is not sponsored or endorsed by it. Trademarks
What's different
- •Optimum Nutrition (ON) Serious Mass has 2× as much total sugar as Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder (6 g vs 3 g per 100 g/ml).
- •Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has 5.3× as much protein as Optimum Nutrition (ON) Serious Mass (78.9 g vs 15 g per 100 g/ml).
- •Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has 3.3× as much saturated fat as Optimum Nutrition (ON) Serious Mass (2 g vs 0.6 g per 100 g/ml).
- •Only Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder lists the flagged ingredient Sweetener.
- •Only Optimum Nutrition (ON) Serious Mass lists the flagged ingredients Maltodextrin, Artificial Flavor (Chocolate) and Sweetener INS 950.
- •1 claim on the Optimum Nutrition (ON) Serious Mass pack did not hold up against its own label.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder
Fewer concerns on: Added & Hidden Sugar, Excess Sodium & Salt, Artificial Sweeteners +1 more
Optimum Nutrition (ON) Serious Mass
Not ahead on any concern we check.
Scores: Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has the higher Decode Label score (5.5 vs 5.0). Which difference matters most depends on who is eating or using it — that's your call.
A higher score means fewer or lighter concerns found under Decode Label's published rules. It is not a medical "safe", and a lower score does not establish that a product is unsafe.
Safety Score
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder is a high-protein supplement with lower sugar and a simpler ingredient list.
Safety Score
Optimum Nutrition (ON) Serious Mass is a mass gainer with a higher carbohydrate and sugar content, and a broader range of vitamins and minerals.
Side by side
What each label says. Nutrition is per 100 g (or ml) so pack and serving sizes don't skew it.
Check the pack for "may contain" warnings if you have an allergy.
Brands choose their own serving sizes, so compare the per-100 figures above.
What these labels can't tell us
- How much of each ingredient is in the product — labels list order, not amounts.
- Cross-contact on the factory line beyond any "may contain" warning, and batch-to-batch variation.
- Anything a laboratory test would find — Decode Label reads labels; it does not test products.
Concern match
A separate lens from the overall Safety Score above — how well each product suits a specific concern, not an overall verdict. Each concern is scored 0–10: higher means less of that concern (5 ≈ neutral).
What matters most to you?
…or what you want it to do — read from the ingredients, not scored by the engine
For , scores higher ( vs ). This is only a per-concern fit lens — it doesn't change the overall safety score, where still has the higher score.
For , the two are evenly matched. The overall safety verdict is unchanged.
This one is read from the two ingredient lists rather than measured by the Decode Label engine — useful for choosing, but it is not a safety finding.
Both Optimum Nutrition (ON) Serious Mass and Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder do not list ingredients that suggest a risk of micronutrient overdose, indicating a similar profile in this regard.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder contains less sugar per 100g (2.96g) compared to Optimum Nutrition (ON) Serious Mass (6g), making it the higher-scoring product for lower added sugar content.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has a slightly higher sodium content per 100g (164.47mg) compared to Optimum Nutrition (ON) Serious Mass (163mg), but both are within a comparable range for this category.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder lists 'Sweetener' without further disclosure, while Optimum Nutrition (ON) Serious Mass explicitly lists 'Sweetener INS 950', allowing for a clearer assessment of its artificial sweetener profile.
Neither Optimum Nutrition (ON) Serious Mass nor Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder list any stimulant ingredients, resulting in an even score for stimulant load.
Both Optimum Nutrition (ON) Serious Mass and Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder do not list any ingredients commonly associated with banned substances or adulterants, leading to an even score.
Both Optimum Nutrition (ON) Serious Mass and Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder list 'Protein blend' as a primary ingredient, indicating a similar approach to proprietary blends.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder lists 'Emulsifier, INS 322(i)' and 'Artificial Flavours', while Optimum Nutrition (ON) Serious Mass includes 'Maltodextrin' as its first ingredient and a more extensive 'Vitamin and Mineral Blend', contributing to a higher additive burden.
Neither Optimum Nutrition (ON) Serious Mass nor Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder list artificial colors or dyes, resulting in an even score.
Declared ingredients linked to common health & supplements goals
Ingredient read — not a safety scoreRead from the two ingredient lists rather than measured by the Decode Label engine, so these sit apart from the scores above and do not change the verdict. 5 means neutral — no ingredient that helps or hinders. Not a health or medical claim — and the ingredient list alone does not establish that the finished product delivers the benefit.
Active Potency & Dosage
Stronger ingredient match: Optimum Nutrition (ON) Serious Mass +2.5Optimum Nutrition (ON) Serious Mass includes specific active ingredients like Creatine Monohydrate and L-Glutamine, which are commonly used for their potency in supporting athletic performance and recovery.
Protein Quality & Amino Profile
Stronger ingredient match: Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder +2.5Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder lists 'Whey Protein Isolate' and 'Hydrolyzed Whey Protein Isolate' as primary protein sources, which are known for their high protein concentration and rapid absorption, contributing to a superior amino profile compared to the blend in Optimum Nutrition (ON) Serious Mass.
Added Sugar & Sweeteners
Stronger ingredient match: Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder +3.0Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has a lower sugar content per 100g and a less explicit listing of artificial sweeteners compared to Optimum Nutrition (ON) Serious Mass, which lists Maltodextrin as its first ingredient and 'Sweetener INS 950'.
Fillers, Binders & Artificial Additives
Stronger ingredient match: Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder +2.0Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has a simpler ingredient list with fewer explicitly named additives compared to Optimum Nutrition (ON) Serious Mass, which starts with Maltodextrin and includes a more extensive 'Vitamin and Mineral Blend' and 'Artificial Flavor'.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder
In its favour, from the label
- Higher protein content per 100g
- Lower sugar content per 100g
- Simpler ingredient list with fewer additives
Label findings to note
- Emulsifier not disclosed — the label does not say which substance this is
- Contains an intense artificial sweetener (named by INS code). Sweeteners are judged by name, and a protein powder is not exempt
- Emulsifier, sweetener not disclosed — 2 additive classes are named without saying which substances they are
- Undisclosed 'Sweetener' and 'Emulsifier' types
- Lower in micronutrients compared to the mass gainer
Optimum Nutrition (ON) Serious Mass
In its favour, from the label
- Contains a comprehensive Vitamin and Mineral Blend
- Includes Creatine Monohydrate and L-Glutamine for additional support
Label findings to note
- Contains an intense artificial sweetener (named by INS code). Sweeteners are judged by name, and a protein powder is not exempt
- High in Maltodextrin, contributing to higher sugar content
- Explicitly lists 'Sweetener INS 950' (Acesulfame Potassium)
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder vs Optimum Nutrition (ON) Serious Mass — frequently asked questions
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has less per 100 g/ml. Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has 3 g and Optimum Nutrition (ON) Serious Mass has 6 g of total sugar per 100 g/ml.
They are about the same. Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has 0 g and Optimum Nutrition (ON) Serious Mass has 0 g of added sugar per 100 g/ml.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has more per 100 g/ml. Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has 78.9 g and Optimum Nutrition (ON) Serious Mass has 15 g of protein per 100 g/ml.
They are about the same. Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has 164 mg and Optimum Nutrition (ON) Serious Mass has 163 mg of sodium per 100 g/ml.
Optimum Nutrition (ON) Serious Mass has less per 100 g/ml. Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder has 2 g and Optimum Nutrition (ON) Serious Mass has 0.6 g of saturated fat per 100 g/ml.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder's ingredient list includes Milk. Optimum Nutrition (ON) Serious Mass's ingredient list includes Milk. Check each pack for "may contain" warnings if you have an allergy.
Optimum Nutrition (ON) RCB Limited Edition Gold Standard 100% Whey Protein Powder lists Sweetener. Optimum Nutrition (ON) Serious Mass lists Maltodextrin, Artificial Flavor (Chocolate) and Sweetener INS 950.
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Comparison generated by Decode Label from each product's listed ingredients. Every score and flagged finding comes from Decode Label's rules engine; the explanations and the ingredient read are written with AI and cannot change a score. Always read the actual label.