Hydrolates are co-products in the process of distillation of herbal material used for making ethereal oils. This process leads to two complementary products: ethereal oil and hydrolate.
Unlike ethereal oils, carrier oils are oily and they are not evaporable. In aromatherapy, they are used for dilluting ethereal oils necessary for preparation of aromatherapy products. Most carrier oils are cold pressed, but not all cold pressed oils are carrier oils. There are many kinds of carrier oils with different viscosity, contents, availability and prices.
Nowadays ethereal oils are mostly used in aromatherapy. However, contemporary scientific researches confirm their more and more frequent oral use. Ethereal oils consist of easily evaporable and biologically active chemical substances. They are derived from different parts of plants: root, skin, leaves, buds, seed and sometimes the whole plant.