An oil-in-water nanoemulsion for cosmetic use as a cosmetic product for skin care, scalp care and hair care, composed of an aqueous phase and an oil phase constituted by oily particles that have an average diameter ranging from 50 to 200 nm, characterized in that the amount of oil phase ranges from 2.0% to 15.0% by weight based on the total weight of the nanoemulsion composition, said oil phase comprises an emulsifying system with at least ceteareth-20, ceteareth-12, glyceryl stearate, cetearyl alcohol and cetyl palmitate, wherein the amount of the emulsifying system present in the oil phase ranges from 1.0% to 2.5% by weight based on the total weight of the nanoemulsion composition, and in that the nanoemulsion is prepared by a process comprising the following steps: Step I: a - adding the components of the oily phase being at least ceteareth-20, ceteareth-12, glyceryl stearate, cetearyl alcohol and cetyl palmitate (phase A) in an auxiliary equipment and heating up to 75°C; b - adding the components of the aqueous phase which comprises at least water (phase B) in a main equipment and heating up to 75°C; c - adding the phase A in the main equipment under stirring of about 1500 rpm for 30 minutes, while keeping the temperature between 70°C and 75°C; d - adding cooling water (phase C) and stirring for 15 minutes at 1500 rpm; Step II a - transferring the composition obtained in Step I to a high pressure equipment comprising at least one piston and two chambers, the first chamber being under a pressure of 1200 bar and the second chamber being under a pressure of 120 bar (depressurization). Step I: a - adding the components of the oily phase being at least ceteareth-20, ceteareth-12, glyceryl stearate, cetearyl alcohol and cetyl palmitate (phase A) in an auxiliary equipment and heating up to 75°C; b - adding the components of the aqueous phase which comprises at least water (phase B) in a main equipment and heating up to 75°C; c - adding the phase A in the main equipment under stirring of about 1500 rpm for 30 minutes, while keeping the temperature between 70°C and 75°C; d - adding cooling water (phase C) and stirring for 15 minutes at 1500 rpm; a - adding the components of the oily phase being at least ceteareth-20, ceteareth-12, glyceryl stearate, cetearyl alcohol and cetyl palmitate (phase A) in an auxiliary equipment and heating up to 75°C; b - adding the components of the aqueous phase which comprises at least water (phase B) in a main equipment and heating up to 75°C; c - adding the phase A in the main equipment under stirring of about 1500 rpm for 30 minutes, while keeping the temperature between 70°C and 75°C; d - adding cooling water (phase C) and stirring for 15 minutes at 1500 rpm; Step II a - transferring the composition obtained in Step I to a high pressure equipment comprising at least one piston and two chambers, the first chamber being under a pressure of 1200 bar and the second chamber being under a pressure of 120 bar (depressurization). a - transferring the composition obtained in Step I to a high pressure equipment comprising at least one piston and two chambers, the first chamber being under a pressure of 1200 bar and the second chamber being under a pressure of 120 bar (depressurization).