Diet & Fitness

For adults (excluding pregnant or nursing women, children, and people with liver or kidney disease), a tea of pennyroyal can be prepared by putting 1–2 teaspoons (5–10 grams) of the herb in 1 cup (250 ml) of boiling water and allowing it to steep for 10–15 minutes.⁵ Up to 2 cups (500 ml) per day can be drunk. Pennyroyal tincture can be mixed with a skin cream and applied topically to repel insects, though it is unknown whether this is effective due to a lack of scientific study. The tincture and volatile oil are not recommended for internal use.