Canavalia gladiata — the sword bean grows up to 18 inches long. A traditional West and Central African food crop, found in Nigerian, Cameroonian, and Ghanaian traditional agriculture. Used in folk medicine for abdominal complaints, infections, and urinary conditions.
Found in West African specialty markets in Houston, Atlanta, and New York. Still grown in home gardens by Nigerian, Ghanaian, and Cameroonian diaspora households. Traditional knowledge of this bean's medicinal properties traveled with enslaved Africans to the Caribbean; the plant appears in Caribbean traditional medicine records.
Sword beans contain Concanavalin A (ConA), a lectin with well-documented immune-stimulating activity — it activates T-lymphocytes and has been studied as an immune modulator in cancer research. The arginine content is among the highest of any legume — arginine is the precursor to nitric oxide, which dilates blood vessels and lowers blood pressure. Traditional West African use for UTIs appears mechanistically supported — the bean's antimicrobial compounds and urinary excretion support this application. L-DOPA presence (lower than Mucuna) provides mild dopaminergic support.
THOROUGH cooking required. Soak 12 hours. Boil vigorously for 60 minutes minimum in multiple changes of water. The outer seed coat contains toxic quantities of ConA when raw. Traditional processing often includes wood ash soaking. Immature young pods of some varieties can be briefly boiled and eaten like green beans.
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