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Optimum Nutrition 100% Whey Protein
Photo: Open Food Facts contributors (CC BY-SA)

Protein powders

Optimum Nutrition 100% Whey Protein

3.96 lb/1.8 kg

Okay out of 100 Medium confidence
  • Ultra-processed
  • Contains non-nutritive sweeteners
  • Contains emulsifiers studied for gut effects
  • Contains artificial flavors
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Why it scores 46

Optimum Nutrition 100% Whey Protein scores 46 out of 100 (Okay) under GoodSwap’s published rules. What moved the score most:

  1. Ultra-processed (NOVA 4): Classified NOVA 4: made with industrial ingredients and additives. Strong
  2. Cellulose gum (carboxymethylcellulose): In a small randomized feeding trial, carboxymethylcellulose modestly increased abdominal discomfort and reduced gut microbiota diversity; in mice it promoted low-grade inflammation. Strong
  3. Sucralose: In a 2022 randomized study, sucralose and saccharin altered the gut microbiome and impaired glucose responses in some people; a 2023 lab study raised questions about its by-product sucralose-6-acetate. Strong

Every line of the math is on The Receipt below, with its evidence tier and sources.

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The Receipt

100% Whey Protein

START100

Ingredients

  • Cellulose gum (carboxymethylcellulose)
    Strong In a small randomized feeding trial, carboxymethylcellulose modestly increased abdominal discomfort and reduced gut microbiota diversity; in mice it promoted low-grade inflammation. [1][2][3][4]
  • Sucralose
    Strong In a 2022 randomized study, sucralose and saccharin altered the gut microbiome and impaired glucose responses in some people; a 2023 lab study raised questions about its by-product sucralose-6-acetate. [5][6][7][8][9]
  • Acesulfame potassium (Ace-K)
    Strong In the NutriNet-Santé cohort, acesulfame-K intake was associated with higher cancer risk; cause and effect is not established. [10][11][8][9]
  • Protein blend (unspecified)
    Info An ingredient typical of ultra-processed foods (NOVA group 4). [12]
  • Whey protein concentrate / isolate
    Info An ingredient typical of ultra-processed foods (NOVA group 4). [12]
  • Natural and artificial flavors
    Strong The label does not disclose which flavoring substances are used. [13][9]
  • Lecithin
    Info An additive class typical of ultra-processed foods (NOVA group 4). [12]
  • Xanthan gum
    Info An ingredient class typical of ultra-processed foods (NOVA group 4). [12]
subtotal−28

Processing

  • Ultra-processed (NOVA 4)
    Strong Classified NOVA 4: made with industrial ingredients and additives. [12]
  • 5 kinds of ultra-processing markers
    Emerging Industrial additive classes found: emulsifier, flavoring, industrial protein, non-nutritive sweetener and thickener, stabilizer or gelling agent. [12]
subtotal−24

Nutrition per 100 g

  • Saturated fat 1.6 g / 100 g
    Strong Contains some saturated fat. [14]
  • Salt 0.9 g / 100 g
    Strong High in salt. [15]
  • Energy 387 kcal / 100 g
    Info Energy-dense for its weight. [9]
  • Protein 77.4 g / 100 g
    Info A good source of protein. [9]
subtotal−2
TOTAL 46Okay

100 − 54 = 46

GTIN 00748927057058 · 2026-06-12

score v1.3.0 · kb 2026.10.11

Medium confidence

Same product, same score. Every time.

Nutrition per 100 g

Energy387 kcal
Fat3.2 g
Saturated fat1.6 g
Carbohydrates12.9 g
Sugars3.2 g
Added sugars0 g
Protein77.4 g
Salt0.9 g

Serving: 1 serving (31 g)

Ingredients

High Moderate Not recognized Tap an ingredient for its evidence and rules.
Label text, as published

PROTEIN BLEND (WHEY PROTEIN ISOLATE, WHEY PROTEIN CONCENTRATE, WHEY PEPTIDES), NATURAL AND ARTIFICIAL FLAVOR, LECITHIN, CELLULOSE GUM, XANTHAN GUM, SALT, SUCRALOSE, ACESULFAME POTASSIUM, LACTASE.

Allergens and diets

Contains: Milk

  • Not vegan
  • Palm-oil-free

Always check the package: recipes change.

Healthiest protein powders in the US

More from Optimum Nutrition

Sources

  1. Randomized Controlled-Feeding Study of Dietary Emulsifier Carboxymethylcellulose Reveals Detrimental Impacts on the Gut Microbiota and Metabolome

    Gastroenterology · March 2022 · Peer-reviewed

    “Relative to control subjects, CMC consumption modestly increased postprandial abdominal discomfort and perturbed gut microbiota composition in a way that reduced its diversity.”

    doi.org

  2. Dietary emulsifiers impact the mouse gut microbiota promoting colitis and metabolic syndrome

    Nature · Mar 5, 2015 · Peer-reviewed

    “carboxymethylcellulose and polysorbate-80, induced low-grade inflammation and obesity/metabolic syndrome in wild-type hosts and promoted robust colitis in mice predisposed to this disorder.”

    doi.org

  3. Food additive emulsifiers and risk of cardiovascular disease in the NutriNet-Santé cohort: prospective cohort study

    BMJ · Sep 6, 2023 · Peer-reviewed

    “This study found positive associations between risk of CVD and intake of five individual and two groups of food additive emulsifiers widely used in industrial foods.”

    doi.org

  4. Re-evaluation of celluloses E 460(i), E 460(ii), E 461, E 462, E 463, E 464, E 465, E 466, E 468 and E 469 as food additives

    European Food Safety Authority · Jan 16, 2018 · Agency assessment

    “The Panel concluded that there was no need for a numerical ADI and that there would be no safety concern at the reported uses and use levels for the unmodified and modified celluloses”

    doi.org

  5. Personalized microbiome-driven effects of non-nutritive sweeteners on human glucose tolerance

    Cell · September 2022 · Peer-reviewed

    “As groups, each administered NNS distinctly altered stool and oral microbiome and plasma metabolome, whereas saccharin and sucralose significantly impaired glycemic responses.”

    doi.org

  6. Toxicological and pharmacokinetic properties of sucralose-6-acetate and its parent sucralose: in vitro screening assays

    Journal of Toxicology and Environmental Health, Part B · Aug 18, 2023 · Peer-reviewed

    “Sucralose-6-acetate significantly increased the expression of genes associated with inflammation, oxidative stress, and cancer”

    doi.org

  7. EFSA finds sucralose safe when used as currently authorised; cannot confirm safety of extending its use

    European Food Safety Authority · Feb 17, 2026 · Agency assessment

    “EFSA’s experts concluded that the sweetener sucralose (E 955) continues to be safe for consumers for its currently authorised uses as a food additive.”

    efsa.europa.eu

  8. WHO advises not to use non-sugar sweeteners for weight control in newly released guideline

    World Health Organization · May 15, 2023 · Agency assessment

    “The recommendation is based on the findings of a systematic review of the available evidence which suggests that use of NSS does not confer any long-term benefit in reducing body fat in adults or children.”

    who.int

  9. Dietary Guidelines for Americans, 2025–2030

    U.S. Department of Health and Human Services and U.S. Department of Agriculture · January 2026 · Regulator

    “Limit foods and beverages that include artificial flavors, petroleum-based dyes, artificial preservatives, and low-calorie non-nutritive sweeteners.”

    cdn.realfood.gov

  10. Artificial sweeteners and cancer risk: Results from the NutriNet-Santé population-based cohort study

    PLOS Medicine · Mar 24, 2022 · Peer-reviewed

    “In this large cohort study, artificial sweeteners (especially aspartame and acesulfame-K), which are used in many food and beverage brands worldwide, were associated with increased cancer risk.”

    doi.org

  11. Re-evaluation of acesulfame K (E 950) as food additive (plain language summary)

    European Food Safety Authority · Apr 30, 2025 · Agency assessment

    “The acceptable daily intake (ADI) considered safe for all population groups was set at 15 mg/kg body weight (bw) per day.”

    efsa.europa.eu

  12. Ultra-processed foods: what they are and how to identify them

    Public Health Nutrition · April 2019 · Peer-reviewed

    doi.org

  13. 21 CFR 101.22 Foods; labeling of spices, flavorings, colorings and chemical preservatives

    Electronic Code of Federal Regulations (eCFR), U.S. Office of the Federal Register · Dec 19, 2016 · Law

    “whose significant function in food is flavoring rather than nutritional.”

    ecfr.gov

  14. Saturated fatty acid and trans-fatty acid intake for adults and children: WHO guideline

    World Health Organization · Jul 17, 2023 · Agency assessment

    “WHO recommends that adults and children reduce saturated fatty acid intake to 10% of total energy intake (strong recommendation).”

    who.int

  15. Sodium reduction (fact sheet)

    World Health Organization · May 11, 2026 · Agency assessment

    “For adults, WHO recommends less than 2000 mg/day of sodium (equivalent to less than 5 g/day salt), or just under a teaspoon.”

    who.int

  16. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses

    BMJ · Feb 28, 2024 · Peer-reviewed

    “Greater exposure to ultra-processed food was associated with a higher risk of adverse health outcomes, especially cardiometabolic, common mental disorder, and mortality outcomes.”

    doi.org

  17. Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake

    Cell Metabolism · July 2019 · Peer-reviewed

    doi.org