Gainful is a personalized nutrition company offering custom-made supplements, including protein powders, hydration mixes, and pre-workout formulas. The service begins with an online quiz to assess an individual’s fitness goals, dietary preferences, and sensitivities. Based on the results, Gainful formulates a unique blend for each customer, ensuring it meets their specific nutritional needs. They also provide access to registered dietitians for ongoing support and advice. The subscription model allows for regular deliveries, making it convenient for customers to maintain their fitness nutrition plans.