One Drop Sunscreen Is a Sunscreen Concentrate Hence Needs To Be Mixed With Either Moisturizer Or Serum. Take One Drop Of Sunscreen Mix With Equal Amount Of Moisturizer Of Your Choice And Apply On Face And Neck. If You Want To Use Serum Add 3 Drops Of Serum Of Your Choice To One Drop Of Sunscreen.

One Drop Is Enough For Face And Neck To Give SPF 50 & PA++++