Not to worry. The white chunks are actually the powdered Brain Vitamins (most likely Alpha GPC) that didn't get dissolved in the mixing process. Our coffee only contains five ingredients -- ground coffee, Alpha GPC, L-Theanine, Taurine and DMAE, so any white residues are simply undissolved amino acids which are perfectly safe to consume.Press it with a spoon and mix it back into the bag and you should be good to go!