The recipe is a closely guarded trade secret, purportedly known to only three people at any given time. So many people have tried to reproduce it that the company maintains on its grounds in Fécamp a "Hall of Counterfeits" (Salle des Contrefaçons). The bottle and label have been imitated, as has the name Bénédictine. The company prosecutes those it feels are infringing on its intellectual property.
The manufacturing process involves several distillations which are then blended. The recipe of Bénédictine is a commercial secret, but it is known to contain 27 herbs and spices, of which the following 21 are publicly known: Angelica, hyssop, juniper, myrrh, saffron, mace, fir cones, aloe, arnica, lemon balm, tea, thyme, coriander, clove, lemon, vanilla, orange peel, honey, red berries, cinnamon, and nutmeg; leaving six unknown ingredients.