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The term oògùn encompasses remedies for physical illnesses as well as charms for protection or success. Both are prepared using the same materials and methods by the same specialists, representing applications of knowledge involving substances and spoken words.
Inside the system they are one kind of thing: applications of knowledge about substances and words to the alteration of what happens.
Yorùbá medicine depends on a physical ingredient and an accompanying verbal incantation (ọ̀fọ̀). Because the incantation often plays on the name of the plant to activate its power, substituting an ingredient with an identical physical profile but a different name fundamentally alters the medicine.
A Yoruba medicine has a material component and a verbal component, and the tradition's own account of how it works requires both.
Diagnosis operates on two complementary registers: identifying proximate bodily symptoms and explaining why a specific individual became afflicted at a particular time. Spiritual or social causes do not replace physical explanations but account for why the illness selected that person.
The Yoruba position is not that the physical cause is illusory.
Yorùbá healing is not unified under a single generic healer, but divided into distinct roles such as diviners, herbalists, bone-setters, and herb sellers. These practitioners have separate training systems, methods, and areas of expertise.
There is a set of distinct occupations with different knowledge bases, different training routes, different patron deities and different competences, and the commonest error in writing about Yoruba medicine is to collapse them into one figure called the traditional healer or, worse, the witch doctor.
Philosophical investigations distinguish ìmọ̀ (first-hand, directly comprehended experience) from ìgbàgbọ́ (information received through others or tradition). Second-hand accounts only attain the status of knowledge once they have been personally tested and verified by the individual.
What the onísègùn count as ìmọ̀ is what a person has seen with their own eyes and experienced at first hand, with the added condition that the experience must be consciously comprehended and not merely undergone [S4].
Divination generates an address that indexes a vast library of precedent narratives (ẹsẹ Ifá). Diviners interpret and match these retrieved cases to the client's circumstances, with the randomisation ensuring the practitioner cannot simply choose a confirming case.
The diviner retrieves a set of cases, matches the client's circumstances against them, and derives a prescription from the matched precedent.
Immobilisation techniques used by traditional bone-setters effectively treat simple closed fractures of the limb shafts. However, peri-articular and open fractures frequently lead to gangrene, nonunion, or amputation due to tight splinting and lack of surgical debridement.
Outcomes are good for closed fractures of the shafts of the humerus, ulna, radius and tibia.
Established in the 1950s by Thomas Adeoye Lambo, the Aro system boarded psychiatric patients in local villages with their families while they received treatment. The programme deliberately collaborated with traditional healers, pioneering community mental healthcare decades before it became common elsewhere.
Lambo brought traditional healers into the arrangement as practitioners alongside the psychiatric staff [S4].
Traditional birth attendants handle routine deliveries well but cannot manage severe obstetric emergencies. Collaborative initiatives that link attendants to healthcare infrastructure succeed by using them as referral pathways rather than standalone providers.
The published evaluation reports 5,606 traditional birth attendants incorporated, 14,124 referrals against 142,206 facility deliveries, a referral rate of 9.9 percent, and a 61.8 percent increase in facility births from 33,077 in 2013 to 53,531 in 2016 [S2].
Yorùbá populations exhibit one of the highest twinning rates globally, occurring entirely through dizygotic (fraternal) twinning rather than identical twinning. The underlying physiological mechanism is elevated follicle-stimulating hormone levels leading to multiple ovulations per cycle.
Nylander's analyses of placentation and zygosity established that the excess is entirely in dizygotic twinning, while monozygotic rates, determined by sex, placentation, blood groups and other genetic markers, vary very little between the ethnic groups compared [S5][S6].
Enslaved Africans introduced cutaneous variolation to the Americas long before Jenner developed vaccination in Europe. Inoculating smallpox pus through skin incisions created milder infections that conferred lifelong immunity against the lethal airborne disease.
West African inoculation knowledge is documented, its technique is known, its transmission to colonial America is established, and it predates European vaccination.
Chemical analysis of bloomery slag from Modakẹ́kẹ́ demonstrates high titanium oxide levels from combining limonite ironstone with ilmenite black sand. This intentional mixing controlled slag viscosity to maximize iron recovery during smelting.
The authors conclude that the slags derive from a skilful bloomery smelting operation extracting the maximum possible amount of iron from the ore [S1].
Excavations at Igbo Olókun revealed that beadmakers produced high lime, high alumina (HLHA) and low lime, high alumina (LLHA) glass from local raw materials as early as the eleventh century. This analytical evidence disproved the long-held assumption that all regional glass beads were merely reworked European imports.
Crucible evidence indicates that LLHA glass was worked together with HLHA glass at the site and may have been made locally as part of the same technological tradition [S2].
Yorùbá numeracy structures intermediate numbers and odd decades by subtracting units from the next higher round figure (back-counting). This pervasive subtraction reflects physical practices of grouping, counting, and adjusting standard heaps of cowrie shells.
The system is based on counting cowrie shells, which served as currency in the region for centuries [S3].
Farmers classify soils into eighteen types across four main classes using visual, tactile, and olfactory criteria alongside bio-indicators like macro-fauna and weeds. Chemical analyses confirm that soils identified as fertile by farmers contain significantly higher levels of nitrogen, phosphorus, potassium, and organic matter.
Although the farmers' indicators were purely qualitative, they were congruent with scientific assessment of fertile and infertile soils in many respects, and sites the farmers reported as fertile were confirmed on laboratory analysis to have higher levels of nitrogen, phosphorus, potassium and organic matter than sites reported as infertile [S4].
Laboratory analyses of open-market herbal products have revealed toxic concentrations of lead, nickel, manganese, and other heavy metals exceeding safe daily intake thresholds. These contamination levels pose substantial risks of organ damage and cancer to regular consumers.
The result: 100 percent of samples contained elevated amounts of heavy metals, with levels of iron, nickel, cadmium, copper, lead, selenium and zinc sufficient to cause adverse health effects when taken regularly as recommended [S8].