The powder may clump over time, particularly if held at temperatures above 86 °F (30 °C). This is a natural process due to a small quantity of moisture held in the ingredient crystals (e.g., glucose). If the powder is clumped, but quite dry, there is no quality defect. It will dissolve in water and the active ingredients remain effective. If the powder appears moist or very sticky, we can provide you with a replacement.