Danzig asked the charity regulator to investigate the foundation after he used the Data Protection Act to obtain copies of emails about him sent by its staff and trustees.
He was referred to as a "dreadfully sad gentleman" in one email. Another urged recipients not to communicate with him.
In a letter to Danzig, the commission said that the medical charity had not "acted in a professional manner at all times".
But it said the commission would not intervene in the dispute because it was a personal matter.
The commission has advised the Pituitary Foundation's executive director, Kit Ashley, to mediate with Danzig. Ashley declined to comment on whether she would do so.