I'm a chemist, not a doctor or pharmacist, but I've paid close attention to medical and drug issues over the years. And I question this program's premis that Morrell is responsibile of Hilter's health issues and that his treatments were unorthodox.
I think many of the treatments were innacuous. For example, German's at the time were very health concious so vitamin injects don't strike me has stange. They probably didn't help but would hurt unless given in very high doses. Leaches though considered creepy now were a common though often incorrectly uses treatment in the past. There are some rare conditions, e,g, Polycythemia, it would have been suitable for. Today in 2021, treatment of digestive issues with bacteria is in vogue though unknown in 1992 when this film was made. Hormone treatments have been in and out of favor since World War Two. It sounds like the secret ingredients mentioned were norcotic in nature since they caused euphoria. I can't imagine any of the treatments mentioned causing arteriosclerosis or Parkinson's disease.
That leaves me with a man who had huge responsibilities. He was fighting multiple enemies and loosing. He was increasingly challended by his subordinates. He had endured multiple attempts to assassinate him. Perhaps he felt guilty for ordering the murder of friends and the countless other Holocaust victims. Thankfully for him he did take a good deal of time to rest and relax. But the stress of a job like that must have been extraordinary. And we know know that stress is very unhealthy. Morrell's stimulants and norcotics may have been necessary just to Hitler on his feel. Though I heard nothing to indicate Morrell treated Hitler for stress.