Creatine transporter deficiency (CTD) is a rare genetic disorder that affects the body's ability to transport creatine, a compound essential for cell energy production and muscle and brain ...

Creatine and caffeine are popular supplements that some people take to enhance exercise, sports, and training performance.

to raise awareness for his son Lucas’ disorder, Creatine Transporter Deficiency (CTD). In the challenge, Allen and fellow “Beast Games” contestant Jeremy Grant will walk from Death Valley to ...