oh, I just remembered, it was glutaform that I had a solubility issue. With substance, mine was clumping too. Here is what I did: I would take a shaker cup with substance and dextrose to the gym with me. With about 15min. left I would start shaking it up. I did this a few times during rests. The extra time let it dissolve. IF you still have some left give it a whirl. Interestingly, I've had more probs with the fuzzy navel clumping than anything else.