Peppermint (North African) Oil

Peppermint tea is commonly used for pregnancy-related nausea, but peppermint oil (internal, concentrated) can relax the lower esophageal sphincter and worsen reflux, and some traditions caution against it in early pregnancy due to a mild emmenagogue reputation — tea in normal amounts is generally considered fine.

Large amounts or concentrated peppermint oil are traditionally said to reduce milk supply; occasional tea is unlikely to be an issue but is best kept moderate while establishing supply.

Diluted tea is commonly used for children's upset stomach, but peppermint oil/menthol should never be applied to or near the face of infants and toddlers — it can trigger dangerous breathing spasms (laryngospasm).