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All authors have made a significant contribution to this study and have approved the final manuscript

L-citrulline demonstrates better gastrointestinal tolerance compared to l-arginine, with fewer reports of digestive discomfort at equivalent effective doses

Publishers note All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations or those of the publisher, the editors, and the reviewers

SSH and JO acknowledge support from the MPower COVID-19 Response Fund Award

Niacinamide controls oil and refines skin texture

This is a result of both the pigment shift and the general reduction in oxidative stress, which keeps skin cells looking healthier for longer