Rinaldi, F., Marzani, B., Pinto, D., & Ramot, Y. (2017). A spermidine-based nutritional supplement prolongs the anagen phase of hair follicles in humans: a randomized, placebo-controlled, double-blind study. Dermatology Practical & Conceptual, 7(4), 17-21. https://doi.org/10.5826/dpc.0704a05