How do I safely use peppermint essential oil on my skin, especially for oily or greasy areas?

Peppermint essential oil is highly concentrated and must never be applied undiluted to the skin. For body use — such as a post-activity massage or on areas prone to excess sebum — aim for a 1–2% dilution: roughly 1–2 drops of essential oil per 5 ml (one teaspoon) of carrier oil like jojoba, grapeseed, or sweet almond oil. The source notes a light, toning effect on greasy or shiny skin, which comes from menthol's cooling action and the oil's astringent quality; this makes it a common choice for diluted blends targeting oily zones on the body.

However, the face and scalp are significantly more sensitive. Menthol can cause stinging, redness, or irritation on thin skin and near mucous membranes. If you wish to include it in a facial blend, start at 0.5% (1 drop per 10 ml carrier) and patch-test on the inner forearm for 24 hours first. Avoid the eye area entirely, and do not apply to broken skin, fresh wounds, or areas with eczema or dermatitis. People with known mint intolerance or very reactive skin should skip topical use altogether.

Always wash hands after blending to avoid accidental transfer to eyes or lips. Store the bottle tightly closed in a cool, dark place — heat and light degrade menthol and menthone, reducing both aroma and the cooling sensation. Keep out of reach of children and pets. This product is for external use only and is not intended for ingestion.