Choline is a water-soluble essential nutrient that is usually grouped with B vitamins.pH:4.0-7.0Water (Karl Fisher):≤0.5%Residue On Ignition:≤0.05%Heavy Metals (as Pb):≤0.001% Arsenic (As):≤0.0001%Cadmium (Cd):≤0.00001%Mercury (Hg):≤0.00001%Infrared Spectrum:Conforms to structure1,4-Dioxane:≤10ug/gChromatographic Purity:Individual Impurities: ≤0.3%Total Impurities: ≤2%Yeast and Mold and Coliform:≤100cfu/gE. coli and Salmonella:NegativeStorage and Stability: Store at RT. Stable for 6 months after receipt.