Evidence map›Paper›PMID 31366891›Full record

ArticleScientific reports2019

Poor chemical and microbiological quality of the commercial milk thistle-based dietary supplements may account for their reported unsatisfactory and non-reproducible clinical outcomes.

Marie Fenclova, Alena Novakova, Jitka Viktorova, Petra Jonatova, Zbynek Dzuman, Tomas Ruml, Vladimir Kren, Jana Hajslova, Libor Vitek, Milena Stranska-Zachariasova

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers.

0numbers the graph read from it
0cells of the map it votes in
32citing papers in PubMed
6.5field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

32 citing papers in PubMed, 62 citations in OpenAlex.

  1. Article
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  3. Milk Thistle (Current medicinal chemistry · 2025
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  6. Chemical Standardization of Milk Thistle (Journal of the American Society for Mass Spectrometry · 2024
    Article
  7. Article
  8. Review
  9. Article
  10. Review
  11. Article
  12. Review
  13. Article
  14. Review
  15. Article
  16. Review
  17. Sulfated Phenolic Substances: Preparation and Optimized HPLC Analysis.International journal of molecular sciences · 2022
    Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 3 institutions in 1 country.

Marie FenclovaDepartment of Food Analysis and Nutrition, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic.ORCID http://orcid.org/0000-0001-9920-6110
Alena NovakovaDepartment of Food Analysis and Nutrition, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic.
Jitka ViktorovaDepartment of Biochemistry and Microbiology, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic.
Petra JonatovaDepartment of Food Analysis and Nutrition, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic.
Zbynek DzumanDepartment of Food Analysis and Nutrition, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic.
Tomas RumlDepartment of Biochemistry and Microbiology, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic.
Vladimir KrenLaboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1082, 14000, Prague 6, Czech Republic.
Jana HajslovaDepartment of Food Analysis and Nutrition, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic.
Libor VitekInstitute of Medical Biochemistry and Laboratory Diagnostics and 4th Department of Internal Medicine, 1st Faculty of Medicine, Charles University, Katerinska 32, 12108, Prague 2, Czech Republic. vitek@cesnet.cz.ORCID http://orcid.org/0000-0002-5318-0151
Milena Stranska-ZachariasovaDepartment of Food Analysis and Nutrition, University of Chemistry and Technology, Technicka 3, 16628, Prague 6, Czech Republic. milena.stranska@vscht.cz.
University of Chemistry and Technology, Prague · CZCharles University · CZCzech Academy of Sciences · CZ

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Herbal-based dietary supplements have become increasingly popular. The extract from milk thistle (Silybum marianum), is often used for the treatment of liver diseases. However, serious concerns exist regarding the efficacy, composition, as well as the safety of these over-the-counter preparations. Therefore, the aim of the present study was to investigate the composition as well as chemical and biological safety of 26 milk thistle-based dietary supplements purchased from both the U.S. and Czech markets between 2016 and 2017. The study was focused on a determination of the composition of active ingredients, as well as analyses of possible contaminants including: mycotoxins, plant alkaloids, and pesticide residues, as well as the microbial purity. High-throughput analyses were performed using advanced U-HPLC-HRMS techniques. Large differences in the silymarin content were observed among individual milk thistle preparations, often in contrast with the information provided by the manufacturers. In addition, substantial inter-batch differences in silymarin content were also demonstrated. In all milk thistle preparations tested, large numbers and high concentrations of mycotoxins and several pesticides, as well as the substantial presence of microbiological contamination were detected, pointing to serious safety issues. In conclusion, our results strongly indicate the need for strict controls of the composition, chemical contaminants, as well as the microbiological purity of commercial milk thistle extracts used for the treatment of liver diseases. Poor definition of these preparations together with contamination by biologically active substances may not only account for the inconsistency of clinical observations, but also be responsible for possible herbal-based dietary supplements-induced liver injury.

Indexed as

AntioxidantsBiological ProductsDietary SupplementsHumansLiver DiseasesMycotoxinsPesticidesPhytotherapyPlant ExtractsSilybum marianumSilymarinAntioxidantsBiological ProductsMycotoxinsPesticidesPlant ExtractsSilymarin

Identifiers

PMID31366891
PMCPMC6668463
OpenAlexW2964929118

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.