Cinnamon, turmeric, ginger, cayenne pepper, and nutmeg are common spices, but some have health risks if consumed in large quantities: - Cinnamon contains coumarin which is toxic to the liver in doses over 6mg per day for a 60kg person. Cinnamon oil can also cause kidney damage if ingested. - Cayenne pepper stimulates circulation but can cause kidney and nerve damage or heart issues if used excessively. It is difficult to wash off the skin. - Nutmeg in doses over 5g can cause hallucinations, seizures, and other toxic effects. Consuming as few as two nutmegs may result in death. Large quantities are exc