Kristyn Smith may be known for treating the faces of the rich and famous, but when it comes to skincare, she’s not above a drugstore run. The celebrity esthetician — whose A-list clientele includes models Bella Hadid, Jacquelyn Jablonski and Paige Reifler — told The Post she relies heavily on “supportive, accessible products.” “Price point matters far less than formulation quality and how products are used together,” Smith said, explaining that effectiveness often comes down to strategy, not