In Ayurveda (the Indian system of medicine), hudar is a mixture containing Strychnos nux-vomica. The seeds are first immersed in water for five days, in milk for two days followed by their boiling in milk.<ref name="uses"/> In India, the quality/toxicity of traditional medical crude and processed Strychnos seeds can be controlled by examining the toxic alkaloids using established HPLC methods and/or HPLC-UV methods.