Is this oil suitable for use in homemade cosmetics, like a face cleanser?

Yes, with important precautions, peppermint essential oil can be incorporated into homemade cosmetic formulas, particularly those intended for oily or blemish-prone skin areas where its purifying character is valued. Due to its high concentration and potential intensity, it must be diluted at a very low rate—often just 1 drop per 30 ml (about 2 tablespoons) of a finished product like a gel cleanser, toner, or clay mask base. It should never be the sole active ingredient. Always mix it into a stable, skin-friendly base you have patch-tested first. Because it is a potent aromatic oil, it is more suitable for rinse-off products (like cleansers) than leave-on treatments to minimize the risk of irritation. Consult a specialist before use if you have sensitive skin, rosacea, or are pregnant or breastfeeding.