Guanidine hydrochloride (Standard) is the standard substance of Guanidine hydrochloride, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Guanidine hydrochloride (Aminoformamidine Hydrochloride) is a strong organic base existing primarily as guanidium ions at physiological pH. It is found in the urine as a normal product of protein metabolism. It is also used in laboratory research as a protein denaturant.