Gainful

Gainful is a New York-based personalized sports nutrition company that builds custom protein powders, hydration, pre-workout and performance supplements tailored to each customer's body, goals and dietary needs. Customers take an online quiz, get a formula matched to them by Gainful's algorithm and registered dietitians, and can chat with a real RD about it. Founded by high-school soccer teammates Eric Wu and Jahaan Ansari and incubated at Y Combinator, the brand grew from a dorm-room experiment into a profitable, multi-channel business now sold direct-to-consumer and in Target stores nationwide.