Palo Azul (Eysenhardtia polystachya), also known as "kidney wood," has been traditionally used in Mexican and Central American folk medicine as a remedy for kidney ailments, including kidney stones. The traditional use involves brewing the bark or wood in water to make a tea, which is believed to have diuretic and anti-inflammatory properties. The rationale is that increased urine flow may help flush out small stones or prevent their formation.

However, scientific evidence supporting these claims is very limited. While some preliminary studies have identified antioxidant and potential anti-inflammatory compounds in Palo Azul, there is a lack of robust clinical research specifically evaluating its efficacy or safety for treating or preventing kidney stones in humans. Most available information comes from anecdotal reports and traditional usage rather than controlled scientific studies. As such, current evidence does not substantiate Palo Azul as an effective treatment for kidney stones beyond its traditional use.

Individuals interested in using Palo Azul for kidney stones should consult a healthcare professional, as the absence of clinical data means its benefits and risks remain largely unknown.