Abstract The oil and extract composition of two Bulgarian cultivars of Mentha piperita L., obtained by hydrodistillation and dichloromethane extraction, respectively, were analyzed by GC/MS. The oil yield from âZefirâ was 0.97% and that from âKliment-63â was 0.54%. The oil from âZefirâ was found to be rich in menthol (46.2â50.2%) and menthyl acetate (16.8â22.5%). In the oil from âKliment-63,â the content of these components was lower, while the menthone content was higher (20.0â23.1%).