The Eme’s List™ Sources & Research

We don’t ask you to take our word for it. The studies, government findings, and reporting on this page are the same sources our team reads and analyzes for what we report in Eme’s List™. They’re collected here so you can read them yourself, share them, or bring them to your doctor, pediatrician, pharmacist, or the company that made the product in your medicine cabinet. External links are provided for reference and do not constitute endorsement of the linked site.

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Scientific Research 42

Published, peer-reviewed research on inactive ingredients, listed newest first.

  1. Artificial Dyes

    Toxicological Effects of Tartrazine Exposure: A Review of In Vitro and Animal Studies with Human Health Implications

    Visternicu M et al. Toxics. 2025;13(9):771. doi:10.3390/toxics13090771

    Covers: Tartrazine (FD&C Yellow No. 5), Allura Red (Red 40), Sunset Yellow (Yellow 6)

  2. Artificial Dyes

    Protecting developing brains: urgent need to regulate synthetic food dyes in children's diets

    Fatima S et al. Annals of Medicine & Surgery. 2025;87(10):6918-6919. doi:10.1097/MS9.0000000000003770

    Covers: FD&C dyes (incl. Red 40, Yellow 5/6, Blue 1)

  3. Other Excipients (Overview)

    Excipients in pharmaceuticals: mechanisms of hypersensitivity and the role of global pharmacovigilance

    Malkawi R, Altahrawi L. Saudi Pharmaceutical Journal. 2025;33(4):18. doi:10.1007/s44446-025-00004-8

    Covers: Multiple excipients (broad)

  4. Titanium Dioxide

    EFSA prohibits titanium dioxide in food- should pharmaceuticals be next?

    Dand C, Bajaj A, Wairkar S. Toxicology. 2025;513:154089. doi:10.1016/j.tox.2025.154089

    Covers: Titanium dioxide

  5. Other Excipients (Parabens)

    Endocrine-disrupting chemical, methylparaben, in environmentally relevant exposure promotes hazardous effects on the hypothalamus-pituitary-thyroid axis

    Azeredo DBC et al. Molecular and Cellular Endocrinology. 2025;598:112444. doi:10.1016/j.mce.2024.112444

    Covers: Methylparaben, propylparaben

  6. Other Excipients (Parabens)

    Never say yes to parabens? A review on paraben compounds in potential human exposure risks

    Haldar S, Mukherjee S, Dey A. The Journal of Basic and Applied Zoology. 2025;86(1):13. doi:10.1186/s41936-025-00430-z

    Covers: Parabens

  7. Other Excipients (Overview)

    Excipient induced allergies in oral medications: unravelling the covert threat – a systematic review

    Seth S et al. Internal Medicine Journal. 2024;55(3):353-368. doi:10.1111/imj.16605

    Covers: Multiple excipients

  8. Titanium Dioxide

    Industry's perspective on challenges assessing the in vivo impact of removing titanium dioxide (TiO2) from drug products

    Abend A et al. Journal of Pharmaceutical Sciences. 2024;113(11):3119-3122. doi:10.1016/j.xphs.2024.08.002

    Covers: Titanium dioxide (E171)

  9. Allergen-Based Fillers (Dairy)

    Risks of dairy derived excipients in medications for lactose intolerant and cow milk protein allergic patients

    Figueiredo A et al. Scientific Reports. 2024;14(1):15631. doi:10.1038/s41598-024-66380-8

    Covers: Lactose, milk-protein contaminated lactose

  10. Allergen-Based Fillers (Corn)

    Hidden danger: maize starch excipient allergy

    Lukose L et al. Medical Journal of Australia. 2024;220(4):184-185. doi:10.5694/mja2.52201

    Covers: Maize / corn starch

  11. Other Excipients (PEG)

    Role of anti-polyethylene glycol (PEG) antibodies in the allergic reactions to PEG-containing Covid-19 vaccines: Evidence for immunogenicity of PEG

    Kozma GT et al. Vaccine. 2023;41(31):4561-4570. doi:10.1016/j.vaccine.2023.06.009

    Covers: PEG / anti-PEG IgE

  12. Other Excipients (Polysorbate 80)

    Polyethylene Glycol and Polysorbate 80 Skin Tests in the Context of an Allergic Risk Assessment for Hypersensitivity Reactions to Anti-SARS-CoV-2 mRNA Vaccines

    Nappi E et al. Vaccines. 2023;11(5):915. doi:10.3390/vaccines11050915

    Covers: Polysorbate 80

  13. Dietary Supplements

    Narrative Review: The FDA's Perfunctory Approach of Dietary Supplement Regulations Giving Rise to Copious Reports of Adverse Events

    Li W, Wertheimer A. INNOVATIONS in pharmacy. 2023;14(1):7. doi:10.24926/iip.v14i1.4989

    Covers: Inactive ingredients across supplements

  14. Other Excipients (Overview)

    New Challenges in Drug Allergy: the Resurgence of Excipients

    Venturini Díaz M et al. Current Treatment Options in Allergy. 2022;9(3):273-291. doi:10.1007/s40521-022-00313-6

    Covers: Multiple excipients

  15. Artificial Dyes

    Potential impacts of synthetic food dyes on activity and attention in children: a review of the human and animal evidence

    Miller MD et al. Environmental Health. 2022;21(1):45. doi:10.1186/s12940-022-00849-9

    Covers: FD&C Red 40, Yellow 5, Yellow 6, Blue 1, Blue 2, Green 3, Red 3

  16. Artificial Dyes

    Exposures to FD&C synthetic color additives from over-the-counter medications and vitamins in United States children and pregnant women

    Thilakaratne R et al. Journal of Exposure Science & Environmental Epidemiology. 2022;33(5):787-793. doi:10.1038/s41370-022-00418-9

    Covers: FD&C synthetic food dyes (Red 3, Red 40, Yellow 5, Yellow 6, Blue 1, Blue 2)

  17. Other Excipients (PEG)

    The role and impact of polyethylene glycol on anaphylactic reactions to COVID-19 nano-vaccines

    Bigini P et al. Nature Nanotechnology. 2021;16(11):1169-1171. doi:10.1038/s41565-021-01001-3

    Covers: PEG / lipid nanoparticles

  18. Allergen-Based Fillers (Gluten)

    Gluten in pharmaceutical products: a scoping review

    Lizano-Díez I, Mariño EL, Modamio P. Systematic Reviews. 2021;10(1):218. doi:10.1186/s13643-021-01772-9

    Covers: Wheat starch / gluten

  19. Other Excipients (Overview)

    Hidden Dangers: Recognizing Excipients as Potential Causes of Drug and Vaccine Hypersensitivity Reactions

    Caballero ML et al. The Journal of Allergy and Clinical Immunology: In Practice. 2021;9(8):2968-2982. doi:10.1016/j.jaip.2021.03.002

    Covers: Multiple excipients (PEG, polysorbate, dyes, lactose, gelatin, etc.)

  20. Titanium Dioxide

    Titanium dioxide particles from the diet: involvement in the genesis of inflammatory bowel diseases and colorectal cancer

    Barreau F et al. Particle and Fibre Toxicology. 2021;18(1):26. doi:10.1186/s12989-021-00421-2

    Covers: Titanium dioxide (E171 / TiO2 NPs)

  21. Titanium Dioxide

    Safety assessment of titanium dioxide (E171) as a food additive

    EFSA Panel on Food Additives and Flavourings (Younes M, et al.). EFSA Journal. 2021;19(5):e06585. doi:10.2903/j.efsa.2021.6585

    Covers: Titanium dioxide (E171)

  22. Other Excipients (PEG)

    Polyethylene glycol (PEG) is a cause of anaphylaxis to the Pfizer/BioNTech mRNA COVID-19 vaccine

    Sellaturay P et al. Clinical & Experimental Allergy. 2021;51(6):861-863. doi:10.1111/cea.13874

    Covers: Polyethylene glycol (PEG / macrogol)

  23. Other Excipients (Parabens)

    Amended Safety Assessment of Parabens as Used in Cosmetics

    Cherian P et al. International Journal of Toxicology. 2020;39(1_suppl):5S-97S. doi:10.1177/1091581820925001

    Covers: Parabens (methyl, ethyl, propyl, butyl)

  24. Titanium Dioxide

    Foodborne Titanium Dioxide Nanoparticles Induce Stronger Adverse Effects in Obese Mice than Non-Obese Mice: Gut Microbiota Dysbiosis, Colonic Inflammation, and Proteome Alterations

    Cao X et al. Small. 2020;16(36):2001858. doi:10.1002/smll.202001858

    Covers: Titanium dioxide (E171 vs nano-TiO2)

  25. Titanium Dioxide

    Effect of Long-Term Intake of Dietary Titanium Dioxide Nanoparticles on Intestine Inflammation in Mice

    Mu W et al. Journal of Agricultural and Food Chemistry. 2019;67(33):9382-9389. doi:10.1021/acs.jafc.9b02391

    Covers: Titanium dioxide nanoparticles

  26. Other Excipients (Overview)

    'Inactive' ingredients in oral medications

    Reker D et al. Science Translational Medicine. 2019;11(483):eaau6753. doi:10.1126/scitranslmed.aau6753

    Covers: Multiple excipients (lactose, dyes, peanut oil, gluten, etc.)

    Why it matters: Researchers examined 42,052 oral medications and found that 92.8% contain at least one ingredient known to trigger allergic or adverse reactions — lactose in about 45%, food dyes in about 33%. The ingredients labelled “inactive” are not always inert for the person swallowing them.

  27. Allergen-Based Fillers (Dairy)

    Allergic reactions to cow's milk proteins in medications in childhood

    Santoro A et al. Acta Biomedica Atenei Parmensis. 2019;90(3-S):91-93. doi:10.23750/abm.v90i3-S.8169

    Covers: Cow's milk proteins in medications

  28. Dietary Supplements

    Unapproved Pharmaceutical Ingredients Included in Dietary Supplements Associated With US Food and Drug Administration Warnings

    Tucker J et al. JAMA Network Open. 2018;1(6):e183337. doi:10.1001/jamanetworkopen.2018.3337

    Covers: Hidden pharmaceutical ingredients

  29. Other Excipients (Overview)

    Excipients in Neonatal Medicinal Products: Never Prescribed, Commonly Administered

    Valeur KS, Holst H, Allegaert K. Pharmaceutical Medicine. 2018;32(4):251-258. doi:10.1007/s40290-018-0243-9

    Covers: Multiple excipients

  30. Other Excipients (Propylene Glycol)

    The Cumulative Daily Tolerance Levels of Potentially Toxic Excipients Ethanol and Propylene Glycol Are Commonly Exceeded in Neonates and Infants

    Valeur KS et al. Basic & Clinical Pharmacology & Toxicology. 2018;122(5):523-530. doi:10.1111/bcpt.12950

    Covers: Propylene glycol, benzyl alcohol

  31. Other Excipients (Overview)

    Choosing a medication brand: Excipients, food intolerance and prescribing in older people

    Page A, Etherton-Beer C. Maturitas. 2018;107:103-109. doi:10.1016/j.maturitas.2017.11.001

    Covers: Multiple excipients (incl. excipients in geriatric polypharmacy)

  32. Artificial Dyes

    Safety and regulatory review of dyes commonly used as excipients in pharmaceutical and nutraceutical applications

    Pérez-Ibarbia L et al. European Journal of Pharmaceutical Sciences. 2016;93:264-273. doi:10.1016/j.ejps.2016.08.026

    Covers: FD&C Red 3, Red 40, Yellow 5, Yellow 6, Blue 1, Blue 2

  33. Titanium Dioxide

    Titanium dioxide nanoparticles exacerbate DSS-induced colitis: role of the NLRP3 inflammasome

    Ruiz PA et al. Gut. 2016;66(7):1216-1224. doi:10.1136/gutjnl-2015-310297

    Covers: Titanium dioxide (TiO2 NPs)

  34. Allergen-Based Fillers (Soy)

    Adverse reaction to benzathine benzylpenicillin due to soy allergy: a case report

    Barni S et al. Journal of Medical Case Reports. 2015;9(1):134. doi:10.1186/s13256-015-0602-z

    Covers: Soy lecithin

  35. Allergen-Based Fillers (Dairy)

    Hypersensitivity Reaction After Inhalation of a Lactose-Containing Dry Powder Inhaler

    Robles J, Motheral L. The Journal of Pediatric Pharmacology and Therapeutics. 2014;19(3):206-211. doi:10.5863/1551-6776-19.3.206

    Covers: Lactose (with milk-protein contamination)

  36. Other Excipients (Propylene Glycol)

    Propylene Glycol Toxicity in Children

    Lim TY, Poole RL, Pageler NM. The Journal of Pediatric Pharmacology and Therapeutics. 2014;19(4):277-282. doi:10.5863/1551-6776-19.4.277

    Covers: Propylene glycol

  37. Other Excipients (Polysorbate 80)

    Hypersensitivity reaction to human papillomavirus vaccine due to polysorbate 80

    Badiu I et al. BMJ Case Reports. 2012;2012:bcr0220125797. doi:10.1136/bcr.02.2012.5797

    Covers: Polysorbate 80 (Tween 80)

  38. Artificial Dyes

    Meta-Analysis of Attention-Deficit/Hyperactivity Disorder or Attention-Deficit/Hyperactivity Disorder Symptoms, Restriction Diet, and Synthetic Food Color Additives

    Nigg JT et al. Journal of the American Academy of Child & Adolescent Psychiatry. 2012;51(1):86-97.e8. doi:10.1016/j.jaac.2011.10.015

    Covers: Synthetic food dyes (general)

  39. Other Excipients (Propylene Glycol)

    Exposure to the pharmaceutical excipients benzyl alcohol and propylene glycol among critically ill neonates

    Shehab N et al. Pediatric Critical Care Medicine. 2009;10(2):256-259. doi:10.1097/pcc.0b013e31819a383c

    Covers: Benzyl alcohol, propylene glycol

  40. Allergen-Based Fillers (Soy)

    Type I Hypersensitivity in an Asthmatic Child Allergic to Peanuts: Was Soy Lecithin to Blame?

    Béliveau S et al. Journal of Cutaneous Medicine and Surgery. 2008;12(1):27-30. doi:10.2310/7750.2007.00031

    Covers: Soy lecithin

  41. Other Excipients (Sulfites)

    Sulfites—A Food and Drug Administration Review of Recalls and Reported Adverse Events

    Timbo B et al. Journal of Food Protection. 2004;67(8):1806-1811. doi:10.4315/0362-028x-67.8.1806

    Covers: Sulfites

  42. Artificial Dyes

    Tartrazine exclusion for allergic asthma

    Ardern KD, Ram FSF. Cochrane Database of Systematic Reviews. 2001;2017(9):CD000460. doi:10.1002/14651858.CD000460

    Covers: Tartrazine (FD&C Yellow No. 5)

Government & Regulatory 6

Findings, safety alerts, and rulemaking from the FDA, EMA, and other public agencies.

  1. Artificial Dyes

    HHS, FDA to Phase Out Petroleum-Based Synthetic Dyes in Nation's Food Supply

    U.S. Department of Health & Human Services / FDA. FDA press announcement

    Covers: FD&C Red 40, Yellow 5, Yellow 6, Blue 1, Blue 2, Green 3 (+ Citrus Red 2, Orange B)

  2. Artificial Dyes

    FD&C Red No. 3 — Revocation of authorization for use in food and ingested drugs

    U.S. Food and Drug Administration (FDA). FDA.gov (order published in the Federal Register Jan 16, 2025)

    Covers: FD&C Red No. 3 (erythrosine)

  3. Other Excipients (Sulfites)

    FDA alerts health care professionals, compounders and patients of potential safety risks associated with sulfite-containing compounded drugs

    U.S. Food and Drug Administration (FDA). FDA.gov — compounding safety alert

    Covers: Sulfites (sodium metabisulfite, sodium bisulfite)

  4. Titanium Dioxide

    Use of titanium dioxide as excipient in human and veterinary medicines and identification of alternatives — industry feedback report to EMA (Annex I)

    EFPIA, AESGP, Medicines for Europe, EUCOPE, AnimalhealthEurope, Access VetMed, TiO2 Alternatives Consortium, IPEC (industry submission to the European Medicines Agency). European Medicines Agency (EMA) website

    Covers: Titanium dioxide (TiO2)

  5. Artificial Dyes

    Health Effects Assessment: Potential Neurobehavioral Effects of Synthetic Food Dyes in Children

    California Office of Environmental Health Hazard Assessment (OEHHA) — Miller MD, Golub M, Marty M, Steinmaus C, et al. California EPA / OEHHA

    Covers: FD&C Red 3, Red 40, Yellow 5, Yellow 6, Blue 1, Blue 2, Green 3

  6. Other Excipients (Propylene Glycol)

    Questions and answers on propylene glycol used as an excipient in medicinal products for human use (EMA/CHMP/704195/2013)

    European Medicines Agency (EMA) — Committee for Medicinal Products for Human Use (CHMP). EMA scientific guideline (adopted by CHMP 15 Dec 2016)

    Covers: Propylene glycol

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