Butea superba is a vining shrub native to Thailand, Vietnam, and India thought by locals to be an aphrodisiac among other effects. It is abundantly distributed in the Thai deciduous forest and has been popular among Thai males for its supposed effects on rejuvenation and sexual vigor. In English it has variously been called red kwao krua, creeping butea, butea gum tree, flame of the forest, and climbing palas.
Existing open trials have come to conflicting conclusions about the efficacy of butea, though they used completely different products at different doses and in different populations. No placebo-controlled clinical studies exist so far to support aphrodisiac activity.
One study in rats found the application of high doses of dried plant material (200 mg/kg body weight) had a negative impact on several blood parameters and decreased testosterone
- Pueraria mirifica (white kwao krua)
- Suntara A. The remedy pamphlet of Kwao Krua tuber of Luang Anusarnsuntarakromkarnphiset. Chiang Mai, Thailand: Chiang Mai Upatipongsa Press; 1931.
- Yarnell, Eric (2016). Natural Approach to Urology and Men's Health (2nd ed.). Wenatchee, WA: Wild Brilliance Press. ISBN 978-1-933350-69-1.
- Roengsamran S, Petsom A, Ngamrojanavanich N, Rugsilp T, Sittiwichienwong P, Khorphueng P, et al. (2000). "Flavonoid and flavonoid glycoside from Butea superba Roxb. and their cAMP phosphodiesterase inhibitory activity". J Sci Res Chula Univ. 25: 169–76.
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