Gas Chromatography-Mass Spectrometry Analysis and Antidiabetic Effect of Fractionated Extract of Strophanthus hispidus - Muyiwa SAMUEL FAGEYINBO; Temitayo ESTHER ADEYEOLUWA; Abidemi JAMES AKINDELE; Esther OLUWATOYIN AGBAJE (African Journal of Pharmacy and Alternative Medicine, 2026)