Gainful, a startup offering personalized subscriptions to protein powders and hydration products, is announcing that it has raised $7.5 million in Series A funding. “In my personal experience, trying to find a protein powder can be a very overwhelming experience,” Wu said. The company will then recommend a powder for you, as well as providing ongoing access to a registered dietitian who can answer any additional questions. At the same time, you still need a subscription to the protein powder (pricing starts at $39) to get access to additional products. If you’re hydrating properly, you can work harder during your exercise, and your personalized protein powder is working harder for you.