Some herbs are sticky and greasy in nature, i.e. Mai Men Dong, Dan Shen, Sheng Di Huang, Shu Di Huang, etc. Therefore, the formulas which contain these herbs will be lumped easily. This is common condition and the safety of product is guaranteed as the agglomerates can be stirred.
In general, fine particles tend to clump and agglomerate if they are moist or tacky or the lid was not closed tightly, especially that Ko Da's products are concentrated in higher ratio. The TCM products shall be stored at dry place and protect from heat. Kindly close the lid tightly everytime after using.
If it is a refillable prescription, please place the medicine sachet bags into a sealed PE bag and put into refrigerator to avoid lumping.