The present invention relates to an improved extraction process for an alkaloid glycoside extract from the species Solanum. In this process, a ground, dried plant tissue of the species Solanum is subjected to alcohol extraction using methanol, the extract is dried and dissolved in a weak volatile acid and centrifuged, the supernatant is precipitated using a volatile base, and the precipitate is thoroughly washed and dried. Extracts having high purity, and products made by the process are also provided.