‘Metal Contents and Acute Toxicity of Combined Vernonia amygdalina Leaves and Garcinia kola Seeds-VAGK, a Herbal and Nutritional Formulation in Male Wistar Rats’ (2019) African Journal of Biomedical Research, 22(2), pp. 187–194. Beschikbaar op: https://www.ojshostng.com/index.php/ajbr/article/view/2260 (Geraadpleegd: 21 mei 2026).