ClinicalTrials.gg
CompletedNCT01576627Updated Jan 4, 2013

Zinc Absorption From Zinc Citrate, Zinc Gluconate and Zinc Oxide

An interventional study of zinc citrate and Zinc Gluconate in Healthy, sponsored by Prof. Michael B. Zimmermann. Completed at 1 site in Switzerland. Open to participants aged 18 Years to 45 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2013-01-04.

Sponsored by Prof. Michael B. Zimmermann · Not applicable and Interventional

Phase
Not applicable
Study type
Interventional
Enrollment
15
Allocation
Randomized
Ages
18 Years to 45 Years
Sex
All
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Study summary

The goal of this trial is to evaluate zinc citrate, a zinc compound with promising sensory properties and a high zinc content, as an alternative zinc compound to be used for supplementation or food fortification. The bioavailability of zinc citrate given as a supplement to young Swiss adults will be assessed and compared to the bioavailability of the commonly used zinc compounds zinc gluconate and zinc oxide.

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Conditions studied

  • Healthy
03

In context

Lead sponsor

Prof. Michael B. Zimmermann is the lead sponsor of 5 studies on the registry; none are open to participants now.

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

04

Who can participate

Ages eligible
18 Years to 45 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Male or female of 18 to 45 years old
  • in the range of 19 to 25
  • No mineral and vitamin supplements two weeks prior to the study and during the whole duration of the study

Exclusion criteria

Exclusion Criteria:

  • Any metabolic, gastrointestinal or chronic disease (according to the subjects own statement)
  • Long-term medication during the whole study (except for )
  • Vegans
  • Pregnancy
  • Lactation
  • Intention to become pregnant during the course of the study
  • Lack of safe contraception
  • Consumption of mineral and vitamin supplements within 2 weeks prior to 1st test supplement administration
  • Earlier participation in any nutrition study using Zn stable isotopes as well as participation in any other clinical study within the last 30 days and during this study
Terms in these criteria, in plain language(2)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

BMI (body mass index)

Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.

What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

05

Study design

Phase
Not applicable
Allocation
Randomized
Intervention model
Crossover assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
15 participants (actual)

Study arms

  • Experimental
    zinc citrate

    Dietary Supplement: zinc citrate

  • Active comparator
    zinc gluconate

    Dietary Supplement: Zinc Gluconate

  • Active comparator
    zinc oxide

    Dietary Supplement: Zinc oxide

Interventions

  • Dietary supplementzinc citrate

    10 mg of zinc as either zinc citrate

  • Dietary supplementZinc Gluconate

    10 mg of zinc as either zinc gluconate

  • Dietary supplementZinc oxide

    10 mg of zinc as either zinc oxide

06

What researchers measure

Primary outcomes

  1. Fractional absorption of zinc

    Fractional absorption of zinc is estimated by using the double isotope tracer ratio technique by administering 67Zn as oral and 70Zn as intravenous stable isotopes.The urinary enrichment with both isotopes is measured in a spot urine sample by inductively coupled plasma mass spectrometry.

    Time frame: 61 days

07

Study locations

1 site
  • ETH Zurich
    Zurich, 8092, Switzerland
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References and documents

Publications

  • Wegmuller R, Tay F, Zeder C, Brnic M, Hurrell RF. Zinc absorption by young adults from supplemental zinc citrate is comparable with that from zinc gluconate and higher than from zinc oxide. J Nutr. 2014 Feb;144(2):132-6. doi: 10.3945/jn.113.181487. Epub 2013 Nov 20. PubMed 24259556 ↗
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Timeline

Tracking since Sep 25, 2026
Not marked actual or estimatedDates not marked actual or estimated

The record gives a start of Mar 2012, a primary completion of May 2012 and a completion of Nov 2012. It does not say whether these dates are actual or estimated.

How these figures are worked out, and which studies are left out of them.

Registered
Apr 4, 2012
First posted
Apr 12, 2012
Start
Mar 2012
Primary completionActual
May 2012
CompletionActual
Nov 2012
Last update
Jan 4, 2013
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Jan 4, 2013, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT01576627
Lead sponsor
Prof. Michael B. Zimmermann
Responsible party
Prof. Michael B. Zimmermann (Prof, Swiss Federal Institute of Technology) — Sponsor-investigator
First posted
Apr 12, 2012
Start date
Mar 2012
Primary completion
May 2012
Completion
Nov 2012
Last update
Jan 4, 2013

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Jan 2013. You cannot join it, but the record below documents what was studied.

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Discussion

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Studies of the drug tested here: Zinc citrate

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