Every skincare brand needs a hero product: the one formula that defines your identity, earns customer loyalty, and gives people a reason to pay attention. But building that product is where most founders get stuck. Not because the idea is bad. Usually, the vision is strong. The challenge is turning an abstract concept, "I want to create a hydrating serum with clean ingredients", into a real, lab-ready, market-differentiated formulation that actually performs. Here's the roadm