The 6 Best Protein Powders of 2025, Tested by Us

Thorp didn’t just test this product for this review, “Thorne is one of the supplement brands I have used the most, and its protein powder has been a mainstay in my routine,” he says. And for good reason: It boasts 21g of bioavailable whey protein isolate, and just 4g of carbs, 1g of fat, and 100 calories. With such a low calorie count, you can also mix this powder with other ingredients (fruit, peanut butter, etc.) to create a hearty, protein-packed smoothie.When looking for the best protein powder for athletes of all ages, we want two things. First, we need an all-around solid product that boasts ample protein. Second, we need a product that is thoroughly third-party tested and certified safe for competitive athletes. Thorne Whey Protein Isolate ticks both of those boxes, and it also happens to taste great, according to Thorp.”The taste of the chocolate flavor is smooth, and blends well with any fruit or additional nutrition you want to add, or just on its own with water or milk,” Thorp says. “There is a mild amount of sweetness, but it doesn’t overpower. The result is pretty pleasant as far as taste.” While the flavor and macros are great, it’s worth noting that this protein does contain gums, which some athletes may avoid. Thorne also costs a bit more than average at .17 per serving—but if you’re a competitive athlete looking for a certified product, that extra cost should provide the assurance you need.