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Metamucil 4-in-1 Fiber
Photo: Open Food Facts contributors (CC BY-SA)

Dietary supplements

Metamucil 4-in-1 Fiber

36.8 oz

Good out of 100 Medium confidence
  • Dye with an EU warning label
  • Contains synthetic dyes
  • Contains non-nutritive sweeteners
  • Contains artificial flavors
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Why it scores 75

Metamucil 4-in-1 Fiber scores 75 out of 100 (Good) under GoodSwap’s published rules. What moved the score most:

  1. Aspartame: Labels must warn people with phenylketonuria (PKU) because aspartame contains phenylalanine (US and EU). Regulatory
  2. Yellow 6: In the EU and UK, foods with this color must state that it "may have an adverse effect on activity and attention in children". Regulatory
  3. Maltodextrin: An additive class typical of ultra-processed foods (NOVA group 4). Info

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

The Receipt

4-in-1 Fiber

START100

Ingredients

  • Aspartame
    Regulatory Labels must warn people with phenylketonuria (PKU) because aspartame contains phenylalanine (US and EU). [1][2][3][4][5][6][7][8][9]
  • Yellow 6
    Regulatory In the EU and UK, foods with this color must state that it "may have an adverse effect on activity and attention in children". [10][11][12][13][14]
  • Maltodextrin
    Info An additive class typical of ultra-processed foods (NOVA group 4). [15]
  • Natural and artificial flavors
    Strong The label does not disclose which flavoring substances are used. [16][9]
subtotal−25.5
TOTAL 75Good

100 − 25.5 = 74.5 → 75

GTIN 00037000741367 · 2026-09-28

score v1.3.0 · kb 2026.10.11

Medium confidence

Same product, same score. Every time.

Nutrition per 100 g

Energy259 kcal
Fat0 g
Carbohydrates86.2 g
Added sugars0 g
Fiber51.7 g
Protein0 g
Salt0.2 g

Serving: 2 rounded teaspoons (11.6 g)

Ingredients

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

Psyllium husk, maltodextrin, citric acid, natural and artificial orange flavor, aspartame, Yellow 6

Allergens and diets

  • Palm-oil-free

Always check the package: recipes change.

More from Metamucil

Sources

  1. 21 CFR 172.804 Aspartame

    Electronic Code of Federal Regulations (eCFR), U.S. Office of the Federal Register · Mar 24, 2023 · Law

    “PHENYLKETONURICS: CONTAINS PHENYLALANINE”

    ecfr.gov

  2. Regulation (EU) No 1169/2011, Annex III point 2.3 (aspartame)

    European Union (Official Journal) · Oct 25, 2011 · Law

    “‘contains a source of phenylalanine’ shall appear on the label in cases where aspartame/aspartame-acesulfame salt is designated in the list of ingredients by its specific name.”

    eur-lex.europa.eu

  3. Aspartame hazard and risk assessment results released (IARC, WHO and FAO joint news release)

    World Health Organization · Jul 14, 2023 · Agency assessment

    “Citing “limited evidence” for carcinogenicity in humans, IARC classified aspartame as possibly carcinogenic to humans (IARC Group 2B) and JECFA reaffirmed the acceptable daily intake of 40 mg/kg body weight.”

    who.int

  4. Carcinogenicity of aspartame, methyleugenol, and isoeugenol (IARC Monographs Vol. 134 working group summary)

    The Lancet Oncology · August 2023 · IARC

    doi.org

  5. Aspartame and Other Sweeteners in Food

    U.S. Food and Drug Administration · Feb 27, 2025 · Regulator

    “The FDA disagrees with IARC’s conclusion that these studies support classifying aspartame as a possible carcinogen to humans.”

    fda.gov

  6. EFSA completes full risk assessment on aspartame and concludes it is safe at current levels of exposure

    European Food Safety Authority · Dec 10, 2013 · Agency assessment

    “Aspartame and its breakdown products are safe for human consumption at current levels of exposure”

    efsa.europa.eu

  7. 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

  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. Regulation (EC) No 1333/2008 of 16 December 2008 on food additives

    European Union (Official Journal) · Dec 16, 2008 · Law

    “may have an adverse effect on activity and attention in children.”

    eur-lex.europa.eu

  11. Regulation (EC) No 1333/2008 (as it applies in the UK), Annex V: food colours requiring additional labelling

    legislation.gov.uk (The National Archives) · Law

    “may have an adverse effect on activity and attention in children.”

    legislation.gov.uk

  12. Food additives and hyperactive behaviour in 3-year-old and 8/9-year-old children in the community: a randomised, double-blinded, placebo-controlled trial

    The Lancet · November 2007 · Peer-reviewed

    “Artificial colours or a sodium benzoate preservative (or both) in the diet result in increased hyperactivity in 3-year-old and 8/9-year-old children in the general population.”

    doi.org

  13. Tracking Food Industry Pledges to Remove Petroleum Based Food Dyes

    U.S. Food and Drug Administration · Regulator

    “FD&C Green No. 3, FD&C Red No. 40, FD&C Yellow No. 5, FD&C Yellow No. 6, FD&C Blue No. 1, and FD&C Blue No. 2—by the end of 2027.”

    fda.gov

  14. California AB 2316 (2024), Pupil nutrition: substances: prohibition

    California Legislative Information · Sep 28, 2024 · Law

    “beginning December 31, 2027, would prohibit a school district, county superintendent of schools, or charter school”

    leginfo.legislature.ca.gov

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

    Public Health Nutrition · April 2019 · Peer-reviewed

    doi.org

  16. 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

  17. HHS, FDA to Phase Out Petroleum-Based Synthetic Dyes in Nation’s Food Supply (press release)

    U.S. Food and Drug Administration · Apr 22, 2025 · Regulator

    “Initiating the process to revoke authorization for two synthetic food colorings—Citrus Red No. 2 and Orange B—within the coming months.”

    fda.gov