A:  Foaming is expected when mixing blends that contain protein. 

This is totally normal. Protein, by its nature, tends to foam when agitated.

This is why we do not recommend including protein in Custom Hydration mixes designed for running or high intensity training. Vigorous movements can create "sloshing" of your stomach contents, which can lead to bloating, gas, and other not-so-fun GI symptoms.

If you have protein in an endurance mix, you may notice some mild foaming after mixing. But the foaming should dissipate quickly, and you’ll be good to go.