Stranger in a Strange Land Pt. III

"A substance used as an offering for the wrathful dharmapalas, but also applied frequently in the course of magic ceremonies, is blood. In some cases, when the text prescribes a blood-libation to be made, only a symbolic offering of blood is carried out, the cups being filled in reality with some other liquid…For the performance of the magic rites, however, actual blood is to be used…As regards human blood, the blood taken from a corpse or the blood of people suffering from a dangerous, contagious disease, especially of leprosy, further the menstruation-blood of a widow or that of a prostitute are said to be especially efficacious…Other kinds of human blood mentioned in Tibetan magic prescriptions are the blood extracted from the brain of a man who died of insanity, the blood on an eight year old child, and the blood of a child which is the fruit of an incestuous union."

"Human flesh, called in tantric terminology the ‘great meat,’ is another offering presented to the wrathful dharamapalas, though –like in the case of blood – this offering is made only symbolically. Ritual books mention ‘the flesh of a child which had been born out of an incestuous union’ and ‘the flesh of an eight year old child,’ which should be used in magic rites. In certain cases human intestines, especially the liver, bowels, and also the heart are required; further, for the performance of rites of destructive magic, the earlobes, the tip of the nose, eyebrows, and the heart and lips of a man who had been killed in a fight are needed, as well as ‘the vagina of a prostitute of an extremely notorious reputation."