What do you recommend I add the Collagen Performance Boost to - Protein, Hydration or Pre-Workout?

You can choose to mix your Collagen Performance Boost with any of your other Gainful products or in a separate beverage. It can be added to your Protein, Hydration, or Pre-Workout. Collagen is most effective when used around an hour prior to exercise, and is most efficiently absorbed when taken along with Vitamin C which is why each serving of Collagen contains 50mg of Vitamin C.