Expression of concern: Oral carnitine supplementation influences mental health parameters and biomarkers of oxidative stress in women with polycystic ovary syndrome: a randomized, double-blind, placebo-controlled trial and The effects of coenzyme Q10 supplementation on gene expression related to insulin, lipid and inflammation in patients with polycystic ovary syndrome

This article refers to:

RETRACTED ARTICLE: The effects of coenzyme Q10 supplementation on gene expression related to insulin, lipid and inflammation in patients with polycystic ovary syndrome

Oral carnitine supplementation influences mental health parameters and biomarkers of oxidative stress in women with polycystic ovary syndrome: a randomized, double-blind, placebo-controlled trial

We, the Publisher and Editor of Gynecological Endocrinology, are issuing an Expression of Concern for the following articles:

Hamidreza Jamilian, Mehri Jamilian, Mansooreh Samimi, Faraneh Afshar Ebrahimi, Maryam Rahimi, Fereshteh Bahmani, Sama Aghababayan, Mobina Kouhi, Sedighe Shahabbaspour & Zatollah Asemi (2017) Oral carnitine supplementation influences mental health parameters and biomarkers of oxidative stress in women with polycystic ovary syndrome: a randomized, double-blind, placebo-controlled trial, Gynecological Endocrinology, 33:6, 442-447, DOI: 10.1080/09513590.2017.1290071

Elham Rahmani, Mehri Jamilian, Mansooreh Samimi, Maryam Zarezade Mehrizi, Esmat Aghadavod, Elmira Akbari, Omid Reza Tamtaji & Zatollah Asemi (2018) The effects of coenzyme Q10 supplementation on gene expression related to insulin, lipid and inflammation in patients with polycystic ovary syndrome, Gynecological Endocrinology, 34:3, 217-222, DOI: 10.1080/09513590.2017.1381680

Since publication of these articles, serious concerns have been raised about the integrity of the reported methods, results and analysis. We have contacted the authors and the ethics committee of the institution to respond to the concerns raised and they are cooperating with the investigation. However, the authors have not been able to provide the original data associated with these articles, and so as we continue to work through the issues raised, we advise readers to interpret the information presented in these articles with due caution. We will provide an update following the conclusion of our investigation. The authors have been notified about this Expression of Concern.