This study from 2015 (more recent than the sources in the article) claims there's a lack of evidence generally, but showed no effect from their (admittedly smal

This study from 2015 (more recent than the sources in the article) claims there's a lack of evidence generally, but showed no effect from their (admittedly small) trial: https://www.ncbi.nlm.nih.gov/pubmed/26389791 https://www.ncbi.nlm.nih.gov/pubmed/26389791