Part of the audiovisual material embedded on the official website of The Stem Cell Clinic — run by H.T., one of the two doctors accused in connection with the death of Giorgos Mazonakis — is no longer publicly accessible. The videos in question are linked to CD34+ stem cell therapies, the doctor’s appearances in South Korea, and claims regarding the so-called “reversal” of biological age. The related posts remain visible on the clinic’s website, complete with their titles and descriptions. However, where the embedded videos once appeared, a YouTube message now reads: “Video unavailable – This video is private.”
Giorgos Mazonakis: The clinic’s videos that now appear as “private”
One notable example is a post dated December 3, 2025, titled “Interview By The Korean National Broadcast Television SBS News: Insights From Biological Age Reversal Lecture.” According to the description still visible on the page, the post featured an interview related to Ilias Theodoropoulos’s lecture on so-called biological age reversal. The video embedded in that post now appears as private.
A second post from the same date tells the same story. Titled “Presentation At The IFFAS 2025 Fall: Biological Age Reversal Study,” its description remains accessible and references a presentation and panel discussion at IFFAS 2025 Fall on the paper “Biological Age Reversal Through Integrative Treatment and CD34+ Stem Cell Therapy: A Quantitative Analysis.” Here too, the embedded YouTube video is no longer publicly viewable.
That particular presentation was based on a retrospective analysis of 42 patients, aged between 37 and 76, who had undergone the clinic’s treatment protocol. According to the data presented, participants showed an overall “rejuvenation” of approximately 7.9 years, as measured by changes in the PhenoAge index.
Additional embedded videos on the clinic’s website display the same “private content” notice, even as the pages on which they were originally posted continue to remain live and publicly accessible.
The pages themselves offer no indication of when exactly these videos were set to private. What can be confirmed today is that the posts and their descriptions remain published on The Stem Cell Clinic’s website, while the videos embedded within them are being flagged by YouTube as “private.”
