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TerminatedNCT04403646TanCOVIDUpdated Dec 22, 2020

Tannin Specific Natural Extract for COVID-19 Infection

An interventional study of ARBOX and PLACEBO in COVID-19, SARS-CoV 2 and Coronavirus Infection, sponsored by Hospital de Clinicas José de San Martín. Terminated at 1 site in Argentina. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2020-12-22.

Sponsored by Hospital de Clinicas José de San Martín · Not applicable, Interventional, and Treatment

Why this study was terminated
low rate of covid patients
Phase
Not applicable
Study type
Interventional
Enrollment
124
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

There is an urgent need to evaluate interventions that could be effective against the infection with SARS-CoV 2. Tannins based wood extracts are an inexpensive and safe product with protective effect in both bacterial and viral infections likely due to its anti- inflammatory, anti-oxidative effects and their modulation of the intestinal microbiota. This randomized controlled trial seeks to evaluate the efficacy of the tannins based dietary supplement ARBOX in positive COVID-19 patients.

Read the detailed description

The epidemic of 2019 novel coronavirus (causing the disease Covid-19) has expanded from Wuhan throughout China and is being exported to a growing number of countries, some of which have seen onward transmission. COVID-19 caused clusters of severe respiratory illness and was associated with 2% mortality. There is currently no vaccine and no specific antiviral treatment recommended for COVID-19. About 20% of the patients were severe and the mainstay of clinical management is largely symptomatic treatment, with organ support in intensive care for seriously ill patients. Therefore, it is urgent to find a safe and effective therapeutic approach to COVID-19.

Tannins have been shown to have antioxidant, anti-inflammatory, antimicrobial properties and a regulatory effect on the gastrointestinal metabolism.

The investigators will realize a prospective, double-blind, randomized trial to assess the effect of treatment with a dietary supplement (ARBOX), a molecular complex of quebracho and chestnut tannins extract and Vit B12, compared with placebo. 140 COVID-19 patients will be recruited in a single center in Buenos Aires Argentina. 70 patients will receive conventional treatment plus ARBOX (treated group) and 70 patients will receive conventional treatment plus placebo (control group). The effects will be evaluated during the 28 days follow up. The primary end point will be the time of discharge from the hospital. A panel of 27 cytokines level, intestinal microbiota composition and its metabolites will be assessed at day 1 and 14.

02

Conditions studied

  • COVID-19
  • SARS-CoV 2
  • Coronavirus Infection
03

In context

Infections

6,687 studies on the registry are indexed under Infections; 807 are open to participants now.

This study's enrollment of 124 is close to the median of 120 across 4,200 interventional studies indexed under Infections.

Browse Infections studies →

Lead sponsor

Hospital de Clinicas José de San Martín is the lead sponsor of 10 studies on the registry; 4 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Over 18 years of age hospitalized in the general hospitalization room, who meet the definition of "Confirmed case COVID-19" (https://www.argentina.gob.ar/salud/coronavirus-COVID-19/definicion -of-case)

Exclusion criteria

Exclusion Criteria:

  • Pregnancy
  • Lactancy
  • Hypersensitivity to polyphenols
  • Patients unable to receive oral medication (severe cognitive impairment, assisted ventilation, impaired state of consciousness)
  • Lack of consent
  • Participation in any other interventional clinical trial
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Participant, Care provider, Investigator)
Enrollment
124 participants (actual)

Study arms

  • Experimental
    TREATED

    Participants will receive a supply of 28 -- 390 mg ARBOX capsules for 14 days. Patients will be supplemented with 2 capsules of ARBOX per day and standard therapy. Standard treatment includes: Antipyretics or Lopinavir / Ritonavir, Azithromycin and Hydroxychloroquine, as appropriate (treatment currently recommended by the department of Infectious Diseases of the Hospital de Clínicas that could undergo to modifications). In addition, if necessary: supplemental O2, non-invasive ventilation, antibiotic therapy.

    Dietary Supplement: ARBOX

  • Placebo comparator
    CONTROL

    Participants will receive placebo supply for 14 days. The placebo will be administrated with the identical dose as described for the test product. Beside patients will receive the standard theraphy, which includes Antipyretics or Lopinavir / Ritonavir, Azithromycin and Hydroxychloroquine, as appropriate (treatment currently recommended by the department of Infectious Diseases of the Hospital de Clínicas that could undergo to modifications). In addition, if necessary: supplemental O2, non-invasive ventilation, antibiotic therapy.

    Other: PLACEBO

Interventions

  • Dietary supplementARBOX

    dry extract of polyphenols (tannins) form quebracho and chestnut 240 mg, B12 vitamin 0.72 µg

  • OtherPLACEBO

    Matching placebo, twice-daily administration BID as described for the test product, identical number of tablets as given for ARBOX

06

What researchers measure

Primary outcomes

  1. Time to hospital discharge

    defined as the time from first dose of polyphenol extract to hospital discharge

    Time frame: Throughout the Study (Day 0 to Day 28)

Secondary outcomes

  1. 28-day all-cause mortality

    proportion

    Time frame: Throughout the Study (Day 0 to Day 28)

  2. invasive ventilation on day 28

    proportion

    Time frame: Throughout the Study (Day 0 to Day 28)

  3. Difference in Pro and antiinflammatory citoquine levels

    mean difference

    Time frame: day 1-14

  4. Difference in fecal intestinal microbiota composition

    Time frame: day 1-14

  5. Negativization of COVID-PCR at day 14

    proportion

    Time frame: day 14

07

Study locations

1 site
  • Hospital de Clinicas
    Buenos Aires, C1120AAF, Argentina
08

References and documents

Publications

  • Theisen LL, Erdelmeier CA, Spoden GA, Boukhallouk F, Sausy A, Florin L, Muller CP. Tannins from Hamamelis virginiana bark extract: characterization and improvement of the antiviral efficacy against influenza A virus and human papillomavirus. PLoS One. 2014 Jan 31;9(1):e88062. doi: 10.1371/journal.pone.0088062. eCollection 2014. PubMed 24498245 ↗
  • Ueda K, Kawabata R, Irie T, Nakai Y, Tohya Y, Sakaguchi T. Inactivation of pathogenic viruses by plant-derived tannins: strong effects of extracts from persimmon (Diospyros kaki) on a broad range of viruses. PLoS One. 2013;8(1):e55343. doi: 10.1371/journal.pone.0055343. Epub 2013 Jan 25. PubMed 23372851 ↗
  • Zhang L, Cheng YX, Liu AL, Wang HD, Wang YL, Du GH. Antioxidant, anti-inflammatory and anti-influenza properties of components from Chaenomeles speciosa. Molecules. 2010 Nov 22;15(11):8507-17. doi: 10.3390/molecules15118507. PubMed 21102377 ↗
  • Molino S, Pisarevsky A, Mingorance FL, Vega P, Stefanolo JP, Repetti J, Luduena G, Pepa P, Olmos JI, Fermepin MR, Uehara T, Villapol S, Savidge T, Treangen T, Viciani E, Castagnetti A, Piskorz MM. Natural tannin extracts supplementation for COVID-19 patients (TanCOVID): a structured summary of a study protocol for a randomized controlled trial. Trials. 2021 Apr 28;22(1):310. doi: 10.1186/s13063-021-05281-x. PubMed 33910614 ↗

Individual participant data

Plan to share: Undecided

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 22, 2020, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04403646
Lead sponsor
Hospital de Clinicas José de San Martín
Collaborators
SILVATEAM
Responsible party
Maria Marta Piskorz (Neurogastroenterologist at Hospital de Clinicas, Principal Investigator, Hospital de Clinicas José de San Martín) — Principal investigator
First posted
May 27, 2020
Start date
Jun 12, 2020
Primary completion
Oct 20, 2020
Completion
Nov 1, 2020
Last update
Dec 22, 2020

Study contacts

Maria M Piskorz, MD
principal investigator · Hospital de Clinicas Universidad de Buenos Aires

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is terminated, as verified in Dec 2020. You cannot join it, but the record below documents what was studied.

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