In the ever-evolving biohacking and longevity research landscape, Bryan Johnson, the tech entrepreneur and biohacker known for his radical anti-aging quest, has switched from the controversial practice of injecting his son’s blood to a total plasma exchange.

Johnson didn’t make the switch because injecting yourself with your kid’s blood is creepy. He did it because he believed a plasma exchange would keep him alive even longer than infusing himself with his offspring’s vital fluids, he tweeted Tuesday.

Total Plasma Exchange (TPE), or Therapeutic Plasma Exchange, is a medical procedure that removes a patient’s blood, separates the plasma, replaces it with a substitute, and returns the blood to the body.

Advocates say TPE can treat a host of ailments, including myasthenia gravis, Guillain-Barre syndrome, neuropathy, Wilson’s disease, chronic fatigue syndrome, multiple sclerosis, long-haul COVID, and age-related issues like Alzheimer’s and anti-aging.

“By implementing this protocol along with thorough measurement, my team and I aim to figure out what works best when it comes to the use of TPE as a rejuvenation and longevity therapy,” J...