yes. As you have indicated. "If you stay on high dose prednisolone for several days the ACTH will be fully suppressed and the adrenal glands won’t make any cortisol for that whole period. If you stay on prednisolone for several weeks, the adrenal glands will start to shrink, and waste away." https://www.impendo.co.uk/prednisolone/prednisolone-in-vasculitis-and-cortisol-suppression
Other than the items you mentioned, I know of no other natural producers. Addison disease is the adrenal crisis and they use corticosteroids to treat it.