Uses of African Plants and Associated Indigenous Knowledge for the Management of Diabetes Mellitus

Diabetes mellitus (DM) is a common non-communicable and chronic metabolic disorder regarded as a global epidemic with high morbidity and mortality. Although, conventional medicines are available for the management of DM, Indigenous knowledge, including the use of botanicals, has contributed to the management of this life-threatening disease in Africa. This is due to the perceived effectiveness and minimal side effects associated with plants and plant-derived compounds as an affordable remedy against DM. This review focuses on the contribution of Indigenous African plants to the management of DM. Relevant literatures were reviewed from online scientific databases, such as PubMed, ScienceDirect, and Google Scholar, using keywords singly and in combination. The review revealed that Indigenous health practitioners use several medicinal plants in the management of DM, with a range of 14–255 botanicals recorded. Approximately 80 compounds with antidiabetic potency have been isolated from different parts of African medicinal plants, with the majority belonging to flavonoids and terpenoids. Particularly, compounds such as apigenin, combretin B, convallatoxin, kaempferol, and quercetin remain the most promising antidiabetic compounds isolated from African medicinal plants. Limited clinical trials have been conducted on these compounds despite these milestones. There is, therefore, the need for further investigations to explain their antidiabetic effects, particularly under clinical conditions. Plants from which these compounds were isolated were selected based on ethnopharmacological knowledge. With these developments, medicinal plants and Indigenous knowledge remain an integral part of the global strategy to combat DM.