The caltrop is the weeds in fields that we find everywhere in Greece but few know that is a natural ingredient in the production of Viagra. The extract of caltrop effects in men by increasing the male hormone testosterone, increases the number and mobility of sperm and increases the libido. It is also important that is helps on increasing muscle mass and strengthening. It has effect on women as it stimulates the libido and helps to overcome various problems of menopause such as insomnia, stress, oversensitivity and congestion. It regulates the blood circulation and also acts against high blood pressure. The caltrop is a very good digestive and helps to detoxify the digestive system and liver.