The specifications are as follows: Product name:Giant knotweed extract; Botanical name: polygonum cuspidatum sieb Part used: rhizome Packing:25kg/drum Description: orange or redish brown powder Resveratrol: >20% Particle size: 80mesh Loss on drying: <5.0% Heavy metals: <20PPM Arsenic: <4.0% Pesticide residue: Negative Total plate count: <1000cfu/g Molds&Yeasts: <100cfu/g E-coil: Negative Salmonella : Negative