A method is for determining a beauty ritual. The method includes performing a beauty diagnosis of a user, and determining a generic beauty ritual including a set of recommended products selected according to the beauty diagnosis. Each recommended product is associated with a generic dosage and a generic prescription for use. The method further includes measuring, over time, the external stress undergone by the user with an environment sensor carried by the user during a period of time. At each increment of the period, the generic dosage and/or the generic prescription for use of the generic beauty ritual is modified based on the measured external stress to obtain a beauty ritual with recommended products having a dosage and/or a prescription for use enabling to respond to the external stress undergone by the user.