Senekal, M., S. Meltzer, A. Horne, N. C. Abrey, L. Papenfus, S. van der Merwe, and N. J. Temple. “Dietary Supplement Use in Younger and Older Men Exercising at Gyms in Cape Town”. South African Journal of Clinical Nutrition, Vol. 34, no. 1, July 2021, http://www.sajcn.co.za/index.php/SAJCN/article/view/1521.