Process for preparing a dairy product.

Preparation process in a production line of a dairy product comprising a stage of introduction by continuous injection, via the production line, of at least one sterol and / or stanol ester at a given temperature T1, higher or equal to the melting temperature of said ester, and ranging in particular from 35 to 80, in a dairy composition comprises at least equal to T1 a given temperature T2, corresponding to an initial milk-based composition, containing milk proteins and which is devoid of emulsifier, to obtain a mixture, said step of introduction of the sterol and / or stanol before a step of homogenizing said mixture.