Regional Kale as Source of Lutein and Zeaxanthin to Improve Vision of AMD-patients (KALESIGHT)

May 7, 2018 updated by: Volker Boehm, University of Jena

Regional Kale as Source of Lutein and Zeaxanthin to Improve Vision of Patients With Age-related Macular Degeneration - an Alternative to Supplements With Isolated Xanthophylls

The age-related macular degeneration (AMD) is an age-dependent, multi-factorial disease. In Western industrial countries, it is the main cause of visual impairments. In Germany, approximately 4.5 million people suffer from AMD. Genetic as well as nutritional aspects are mainly important in AMD development. Until now, AMD-patients are advised to use supplements based on the carotenoids lutein and zeaxanthin, comprised in high doses and in isolated form. Results showing the effects of food items (kale, spinach) rich in lutein on improvement of vision are scarce. And how much is needed within the diet? Within the planned project, human intervention studies will investigate whether an oil-based kale extract or fresh kale can be used to improve vision of AMD-patients and persons aged 50+ (without AMD). The first study will use volunteers without AMD (>18 y) to investigate if there is a dose-dependent effect of lutein and zeaxanthin (out of a kale extract) on macular pigment optical density (MPOD). This study will also compare the bioavailability of the carotenoids from the extract and from a supplement. A second study (also using volunteers without AMD, >18 y) will compare the bioavailability of lutein and zeaxanthin from the extract and from kale purée. The third study will investigate the effect of the oil-based kale extract on improvements of MPOD and vision of AMD-patients and of a control group (volunteers 50+ without AMD).

Usually, the intestinal absorption of lutein and zeaxanthin is determined by analyzing changes in concentrations in blood plasma. A fast, non-invasive sampling will be evaluated to check the efficacy of an increased uptake of lutein. Thus, the project will test the usability of buccal mucosa cells to detect metabolic changes after an uptake of carotenoids. Besides, the determination of carotenoid contents in skin will be checked on its use as biomarker of carotenoids in plasma and macula.

Thus, the planned research project will evaluate two non-invasive markers of exposition on their usability as markers of absorption of lutein and zeaxanthin in blood and macula. In addition, the minimally needed dosage of lutein and zeaxanthin for AMD prevention will be determined to reduce the possible risk of currently recommended doses of these compounds. The project will also present alternatives (kale extract, kale purée) for AMD prevention and to improve vision to be used instead of currently used high-dose supplements.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

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Intervention / Treatment

Intervention / Treatment

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Study Type

Study Type

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Interventional

Enrollment (Anticipated)

Enrollment

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90

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

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Study Contact

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Study Locations

  • Germany
      • Jena, Germany, 07743
        • Recruiting
        • University Eye Hospital, Friedrich Schiller University Jena

Participation Criteria

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Eligibility Criteria

Eligibility Criteria

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Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • healthy, > 18 years, written consent

Exclusion Criteria:

  • uptake of dietary supplements, glaucoma

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

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Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Placebo Comparator: S1-Placebo
placebo capsule with all ingredients, but without active compound, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-1L
capsule containing 1 mg lutein out of kale, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-2L
capsule containing 2 mg lutein out of kale, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-5L
capsule containing 5 mg lutein out of kale, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S2-Kale_extract
Other: S2: Kale extract versus kale purée
Experimental: S2-Kale_purée
Other: S2: Kale extract versus kale purée
Placebo Comparator: S3-Placebo
Other: S3: Kale extract: AMD-patients
Experimental: S3-AMD-Patients
Other: S3: Kale extract: AMD-patients
Experimental: S3-non-AMD
Other: S3: Kale extract: AMD-patients
Placebo Comparator: S1-Placebo-Tagetes
capsule containing all ingredients, but without active compound, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-1L-Tagetes
capsule containing 1 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-2L-Tagetes
capsule containing 2 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-5L-Tagetes
capsule containing 5 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-10L-Tagetes
capsule containing 10 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency
Dietary supplement: S1: Dosage-dependency
kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
changes in macular pigment optical density MPOD [ODU: optical density units]
Time Frame: baseline and after 4/8 weeks, baseline and after 6/12/18/24 weeks
Changes from baseline to various time points for different parameters of MPOD will be measured: changes in mean MPOD [ODU], changes in max. MPOD [ODU], changes in volume of MPOD [ODU x (degree)2], changes in area of MPOD [degree2]
baseline and after 4/8 weeks, baseline and after 6/12/18/24 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of Jena

Publications and helpful links

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General Publications

Study record dates

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Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
February 1, 2015

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2018

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 1, 2020

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 6, 2014

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 8, 2014

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 13, 2014

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 8, 2018

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 7, 2018

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2018

More Information

Terms related to this study

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • BO 1511/8-1

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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