In Reply We appreciate the perspectives of Obijiofor et al and Naldi et al on our recent article1 and agree broadly with their remarks. In our review, we evaluated the existing literature for nutritional supplementation across a range of hair loss disorders. The studies available on this topic varied in quality and were heterogeneous regarding types of hair loss, comparators, and outcome measures. Given the fundamental limitations of the underlying studies, as highlighted in our article, we refrained from providing specific recommendations or comparisons between treatments.