Cortisone is the inactive form of cortisol. Cortisone shows minimal biological activity per se, reflecting negligible affinity for the glucocorticoid and aldosterone receptors. The kidney, colon and saliva gland have lots of activity for changing cortisol to cortisone (active to inactive) to keep cortisol off the aldosterone receptor. Cortisone is converted back in the liver, fat, etc. (inactive to active).
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