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Head-to-head
Optimum Nutrition (ON) Gold Standard 100% — product pack 6.0 /10
VS
Optimum Nutrition (ON) Serious Mass — product pack 5.0 /10

Optimum Nutrition (ON) Gold Standard 100% 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 about 86% more total sugar than Optimum Nutrition (ON) Gold Standard 100% (6 g vs 3.2 g per 100 g/ml).
  • •Optimum Nutrition (ON) Gold Standard 100% has 5.2× as much protein as Optimum Nutrition (ON) Serious Mass (77.4 g vs 15 g per 100 g/ml).
  • •Optimum Nutrition (ON) Gold Standard 100% has 2.6× as much sodium as Optimum Nutrition (ON) Serious Mass (419 mg vs 163 mg per 100 g/ml).
  • •Optimum Nutrition (ON) Gold Standard 100% has 5.4× as much saturated fat as Optimum Nutrition (ON) Serious Mass (3.2 g vs 0.6 g per 100 g/ml).
  • •Only Optimum Nutrition (ON) Gold Standard 100% lists the flagged ingredient Acesulfame Potassium.
  • •Only Optimum Nutrition (ON) Serious Mass lists the flagged ingredients Maltodextrin, Artificial Flavor (Chocolate) and Sweetener INS 950.
  • •Only Optimum Nutrition (ON) Gold Standard 100% lists the allergen Soy.

Optimum Nutrition (ON) Gold Standard 100%

Fewer concerns on: Added & Hidden Sugar, Excess Sodium & Salt

Optimum Nutrition (ON) Serious Mass

Not ahead on any concern we check.

Scores: Optimum Nutrition (ON) Gold Standard 100% has the higher Decode Label score (6.0 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.

Optimum Nutrition (ON) Gold Standard 100%
Veg Jain
6.0 / 10

Safety Score

Optimum Nutrition (ON) Gold Standard 100% is a protein-focused supplement with a blend of whey proteins and a lower sugar and sodium profile.

VS
Optimum Nutrition (ON) Serious Mass
Veg Jain
5.0 / 10

Safety Score

Optimum Nutrition (ON) Serious Mass is a mass gainer supplement characterized by a high carbohydrate base and a comprehensive vitamin and mineral blend.

Side by side

What each label says. Nutrition is per 100 g (or ml) so pack and serving sizes don't skew it.

Factor Optimum Nutrition (ON) Gold Standard 100% Optimum Nutrition (ON) Serious Mass
Total sugar
3.2 g 6 g
Added sugar
Not on file 0 g
Protein
77.4 g 15 g
Fibre
3.2 g Not on file
Sodium
419 mg 163 mg
Saturated fat
3.2 g 0.6 g
Energy
387 kcal 372 kcal
Ingredients of concern
Acesulfame Potassium Maltodextrin, Artificial Flavor (Chocolate), Sweetener INS 950
Allergens in the ingredient list

Check the pack for "may contain" warnings if you have an allergy.

Milk, Soy Milk
Pack claims checked
7 checked — 3 held up, 1 did not, 3 couldn't be verified 12 checked — 5 held up, 1 did not, 6 couldn't be verified
Serving size (as printed)

Brands choose their own serving sizes, so compare the per-100 figures above.

31g (About 1 Scoop) 334 g (About 2 Scoops)
What we could read
9 ingredients listed; nutrition panel on file 38 ingredients listed; nutrition panel on file

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

Legend
Optimum Nutrition (ON) Gold Standard 100% Optimum Nutrition (ON) Serious Mass
Micronutrient Overdose Even
8.0
8.0

Both Optimum Nutrition (ON) Gold Standard 100% and Optimum Nutrition (ON) Serious Mass are considered even in this category, as neither product lists an excessive concentration of individual micronutrients that would raise concerns for overdose based on their ingredient lists.

Added & Hidden Sugar Less concern: Optimum Nutrition (ON) Gold Standard 100% +1.5
9.0
7.5

Optimum Nutrition (ON) Gold Standard 100% scores higher due to its lower sugar content per 100g (3.23g) compared to Optimum Nutrition (ON) Serious Mass (6g), which also lists Maltodextrin as its primary ingredient, a carbohydrate that can contribute to sugar load.

Excess Sodium & Salt Less concern: Optimum Nutrition (ON) Gold Standard 100% +5.0
10.0
5.0

Optimum Nutrition (ON) Gold Standard 100% leads in this category with a lower sodium content per 100g (419.35mg) compared to Optimum Nutrition (ON) Serious Mass (163mg), which also lists Sodium Chloride as an ingredient.

Artificial Sweeteners Even
3.5
3.5

Both Optimum Nutrition (ON) Gold Standard 100% and Optimum Nutrition (ON) Serious Mass are considered even, as both products contain artificial sweeteners; Optimum Nutrition (ON) Gold Standard 100% lists Acesulfame Potassium, while Optimum Nutrition (ON) Serious Mass lists Sweetener INS 950 (Acesulfame Potassium).

Stimulant Load Even
8.0
8.0

Both Optimum Nutrition (ON) Gold Standard 100% and Optimum Nutrition (ON) Serious Mass are even in this category, as neither product lists any stimulant ingredients.

Banned & Adulterant Risk Even
8.0
8.0

Both Optimum Nutrition (ON) Gold Standard 100% and Optimum Nutrition (ON) Serious Mass are even, as neither product lists ingredients commonly associated with banned substances or adulterants.

Proprietary Blends & Dosing Even
8.0
8.0

Both Optimum Nutrition (ON) Gold Standard 100% and Optimum Nutrition (ON) Serious Mass are even, as both products list their protein components as blends without specific individual dosages, and Optimum Nutrition (ON) Serious Mass also includes a 'Vitamin and Mineral Blend' and 'Medium Chain Triglycerides Powder' without detailed breakdowns.

Fillers & Additive Burden Even
5.0
5.0

Both Optimum Nutrition (ON) Gold Standard 100% and Optimum Nutrition (ON) Serious Mass are even, as both products contain emulsifiers and artificial flavors, with Optimum Nutrition (ON) Serious Mass also including Maltodextrin as its primary ingredient.

Artificial Colours & Dyes Even
8.0
8.0

Both Optimum Nutrition (ON) Gold Standard 100% and Optimum Nutrition (ON) Serious Mass are even, as neither product lists any artificial colors or dyes in their ingredients.

Declared ingredients linked to common health & supplements goals

Ingredient read — not a safety score

Read 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 +2.0
5.0
7.0

Optimum Nutrition (ON) Serious Mass scores higher due to the inclusion of specific active ingredients like Creatine Monohydrate and L-Glutamine, which are not present in Optimum Nutrition (ON) Gold Standard 100%.

Protein Quality & Amino Profile

Stronger ingredient match: Optimum Nutrition (ON) Gold Standard 100% +2.0
8.0
6.0

Optimum Nutrition (ON) Gold Standard 100% scores higher as its protein blend is primarily composed of Whey Protein Isolate, Whey Protein Concentrate, and Hydrolyzed Whey Protein, generally considered high-quality protein sources, while Optimum Nutrition (ON) Serious Mass has a lower overall protein percentage and includes Whey Powder and Calcium Caseinate.

Added Sugar & Sweeteners

Stronger ingredient match: Optimum Nutrition (ON) Gold Standard 100% +3.0
7.0
4.0

Optimum Nutrition (ON) Gold Standard 100% scores higher due to its lower sugar content per 100g, whereas Optimum Nutrition (ON) Serious Mass lists Maltodextrin as its first ingredient and has a higher sugar content.

Fillers, Binders & Artificial Additives

Stronger ingredient match: Optimum Nutrition (ON) Gold Standard 100% +2.0
6.0
4.0

Optimum Nutrition (ON) Gold Standard 100% scores higher as it has fewer listed additives and does not use Maltodextrin as a primary ingredient, unlike Optimum Nutrition (ON) Serious Mass which lists Maltodextrin first and includes a broader range of emulsifiers and artificial flavors.

Proprietary Blends & Label Transparency

Even
5.0
5.0

Both products are neutral as they list protein blends without specific individual protein percentages, and Optimum Nutrition (ON) Serious Mass also includes a 'Vitamin and Mineral Blend' and 'Medium Chain Triglycerides Powder' without detailed breakdowns.

Digestive Tolerance & Bloating

Stronger ingredient match: Optimum Nutrition (ON) Gold Standard 100% +2.0
6.0
4.0

Optimum Nutrition (ON) Gold Standard 100% may be better tolerated due to its higher proportion of whey protein isolate and hydrolyzed whey protein, which are often easier to digest, while Optimum Nutrition (ON) Serious Mass's high Maltodextrin content could potentially lead to digestive discomfort for some individuals.

Optimum Nutrition (ON) Gold Standard 100%

In its favour, from the label

  • Higher protein content per 100g
  • Lower sugar content per 100g
  • Lower sodium content per 100g

Label findings to note

  • Contains an intense artificial sweetener (acesulfame). Sweeteners are judged by name, and a protein powder is not exempt
  • Includes a protein blend without specific individual protein percentages

Optimum Nutrition (ON) Serious Mass

In its favour, from the label

  • Contains a wide array of vitamins and minerals
  • Includes creatine monohydrate and L-glutamine
  • Lower saturated fat content per 100g

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
  • Lower protein content per 100g compared to Gold Standard

Optimum Nutrition (ON) Gold Standard 100% vs Optimum Nutrition (ON) Serious Mass — frequently asked questions

Optimum Nutrition (ON) Gold Standard 100% has less per 100 g/ml. Optimum Nutrition (ON) Gold Standard 100% has 3.2 g and Optimum Nutrition (ON) Serious Mass has 6 g of total sugar per 100 g/ml.

Optimum Nutrition (ON) Gold Standard 100% has more per 100 g/ml. Optimum Nutrition (ON) Gold Standard 100% has 77.4 g and Optimum Nutrition (ON) Serious Mass has 15 g of protein per 100 g/ml.

Optimum Nutrition (ON) Serious Mass has less per 100 g/ml. Optimum Nutrition (ON) Gold Standard 100% has 419 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) Gold Standard 100% has 3.2 g and Optimum Nutrition (ON) Serious Mass has 0.6 g of saturated fat per 100 g/ml.

Optimum Nutrition (ON) Gold Standard 100%'s ingredient list includes Milk and Soy. 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) Gold Standard 100% lists Acesulfame Potassium. 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.