Mucuna pruriens (L.) DC. (Fabaceae), commonly known as velvet bean or cowhage, occupies a paradoxical place among medicinally important legumes: it is simultaneously a source of the world's only commercially viable natural L-3,4-dihydroxyphenylalanine (L-DOPA), a nutritionally dense tribal pulse, a soil-restoring green manure cover crop, and a plant whose pod trichomes deliver one of the most intense pruritogenic reactions known in botany. This review synthesizes recent primary literature to weigh the therapeutic ("friend") and hazardous ("foe") dimensions of the species. On the beneficial side, clinical and preclinical evidence continues to support the antiparkinsonian efficacy of M. pruriens seed powder, which is comparable to synthetic levodopa in several small trials and additionally offers antioxidant, anti-inflammatory, and neuroprotective activity attributed to polyphenols and alkaloids acting alongside L-DOPA. The species also shows reproducible benefit in stress-related male subfertility and continues to be promoted globally as a nitrogen-fixing, weed-suppressing cover crop. On the adverse side, the cysteine protease mucunain and co-localised serotonin in pod trichomes activate protease-activated receptors PAR-2 and PAR-4 to produce histamine-independent pruritus, and the raw seed carries a burden of antinutritional and potentially toxic constituents (tannins, phytates, hydrogen cyanide, trypsin inhibitors, and unmetabolized L-DOPA itself) that necessitate processing before dietary or medicinal use. Reported cases of accidental seed poisoning underscore that “natural” does not equate to “risk-free.” We conclude that M. pruriens is best understood not as strictly friend or foe but as a pharmacologically potent, agronomically valuable, and genuinely hazardous plant whose safe exploitation depends on genotype selection (trichome-reduced cultivars), standardized processing, and dose-controlled clinical use.
Mucuna pruriens, Ethnomedicinal, Phytochemical, Toxicology, a friend or a foe, cowhage
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