Magnetite (Loadstone) cí shí · 磁石

Safety. As with 代赭石 and every mineral drug, the source determines the contamination: arsenic, lead and other heavy metals occur in natural ores, so assay is not optional. It is also an iron load, which matters in haemochromatosis and other iron-overload states. The tradition treats it as cautious where digestion is weak and does not use it where the Spleen and Stomach are cold. One modern warning is worth adding because it is specific and it is not in the classical texts: swallowed magnets are a recognised paediatric emergency — two or more magnets attract through loops of bowel and can cause fistula, perforation and death. Mineral specimens and magnetic beads must be kept away from children. Human safety data in pregnancy and breastfeeding are insufficient. Not for self-directed use.