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. 2022 May 31;6(5):e36339. doi: 10.2196/36339

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©Mariette Abrahams, Rochez O’Grady, Janne Prawitt. Originally published in JMIR Formative Research (https://formative.jmir.org), 31.05.2022.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Formative Research, is properly cited. The complete bibliographic information, a link to the original publication on https://formative.jmir.org, as well as this copyright and license information must be included.

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Phase 2 study flowchart. Baseline relates to a 2-week preintervention phase with variable tracking: diet and lifestyle, stools, symptoms, and Medical Symptoms Questionnaire (MSQ) 1; week 0-8 relates to an 8-week-long collagen supplementation with variable tracking; MSQ 2 was administered 2 weeks after supplementation; and MSQ 3 was administered 8 weeks after supplementation. RD: registered dietitian.