I share my experience with painful B12 deficiency and treatment, and what you and doctors need to know about the dangers of B12 deficiency.

Vitamin B12 deficiency is dangerous. It incapacitated me. This is how I got my running legs back. Don't ignore the symptoms.

Ultrarunning require a lot of discipline. Ian Sharman shares training and race day tips, how to build endurance, his thoughts on DNFs, and m