According to the documentary, most gene therapy implants into the DNA, meaning that it is irreversible.
So, at least according to the documentary, the treatment has had a positive effect on Bryan Johnson.
Custom Image by Ana Nieves
Don’t Die: The Man Who Wants to Live Forever is a documentary by Chris Smith exploring wealthy entrepreneur Bryan Johnson’s quest to defy aging. Johnson invests significant resources to push the boundaries of human longevity, risking his body and fortune in pursuit of extending his lifespan.