Chaparral is a desert shrub (Larrea tridentata). Indigenous peoples of the American Southwest traditionally used the leaves as a tea for various wellness purposes. Today people take it in very dilute infusions, tinctures, or powdered capsules. Some take chaparral for digestion, though solid evidence is lacking. Most modern use is external, applied to the skin.
Oral preparations are highly diluted. A common infusion ratio is 1:6000 or small amounts of tincture. Topical application for skin concerns drives most current usage.
Chaparral contains nordihydroguaiaretic acid (NDGA). This compound is linked to serious liver and kidney toxicity, even at moderate doses. Contact dermatitis is also possible. Many health authorities advise against internal use outright. Avoid chaparral if you are pregnant, breastfeeding, or have any liver or kidney condition.