Al-Risalah al-Dhahabiah ( , ; "The Golden Treatise") is a medical dissertation on health and remedies attributed to Ali al-Ridha (765-818), the eighth Imam of Shia. He wrote this dissertation in accordance with the demand of Ma'mun, the caliph of the time. It is revered as the most precious Islamic literature in the science of medicine, and was entitled as “the golden treatise" due to the order of Ma'mun for writing it in gold ink.
According to the treatise, one's health is determined by four humors of blood, yellow bile, black bile and phlegm, the suitable proportion of which maintain...