If I'm not mistaken CT had open heart surgery due to serious heart problems back in the day...people with such history are usually advised to stay away from high doses of caffeine and other stimulants...he's drink contains over 400mg of caffeine, which is more than twice the caffeine amount of a large espresso, so effectively he's selling something even he shouldn't take.
He had mitral valve surgery and most recently coronary stenting. In one of his blood test videos the Dr also gave him more bad news about his heart.
