As a note on this product, we have imported this product via licensed pharmaceutical exporter – from the same place that this is manufactured in China. Additionally, the product has been analytically tested, and it’s molecular mass has been determined. Simply put, this is the best and most pure MDPV Crystals you are going to get on the market. Others claim to have pure Research Chemicals but this is the REAL DEAL! I am not going to say anything bad about others selling similar product but this is the best most chemically sound product you will find, anywhere, hands down.