Mucuna pruriens (velvet bean) is a tropical legume whose seeds are naturally rich in levodopa, the main drug used for Parkinson's disease. It has long been used in traditional Ayurvedic Indian medicine, and it is sold as a supplement and studied as a low-cost levodopa source for Parkinson's.
Also known as: Mucuna, velvet bean, kapikachhu, L-dopa bean.
Parkinson's trials used single doses of 15 g and 30 g of a mucuna preparation (Katzenschlager 2004) and single weight-based doses of roasted seed powder (Cilia 2017); in a 12-month trial, doses were adjusted for body weight and disease stage (Cilia, 12-month trial). These are study protocols, not a recommendation.
It is sold in the US as a dietary supplement. Under the 1994 dietary supplement law (DSHEA), FDA does not approve dietary supplements before they are marketed, and the maker, not FDA, is responsible for safety and labeling.
What studies show: in a small 2004 trial of 8 people with Parkinson's, 30 g of mucuna worked faster and gave higher levodopa levels than standard levodopa/carbidopa, without more dyskinesias (involuntary movements). In a 2017 crossover trial of 18 people with advanced Parkinson's, single doses of mucuna powder performed as well as standard levodopa with fewer side effects. A 12-month trial in 32 people with untreated Parkinson's in sub-Saharan Africa found results similar to standard levodopa; side effects were more common with mucuna (56% vs 37.5%), though the difference was not statistically significant.
Risks: a 2026 review by Parkinson's specialists says mucuna is a potent dopamine therapy that needs the same caution as prescription levodopa. Overuse and unsupervised self-treatment have been linked to dyskinesia, dopamine dysregulation syndrome and psychiatric problems, and improper seed preparation has caused toxicity. The authors say its use should stay within clinical trials or neurologist-led care until there is more long-term safety evidence.
We could not find a single published half-life or time to peak for mucuna that applies to a supplement dose, so we do not list one. Herbal products are mixtures of many plant compounds, so no single figure would describe them. In one trial, 30 g of mucuna reached peak levodopa levels faster than standard levodopa/carbidopa and took effect in about 35 minutes versus about 69 minutes (Katzenschlager 2004).
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