It's so obvious it was the first thing your doctor checked. And yet, the lab says your B12 levels are normal. Most patients stop here. I was one such patient, until I learned that B12 deficiency had been one of the biggest missing puzzle pieces in my health journey for decades... Learn along with me as I take you through information about B12 deficiency I wish I had known when I first got sick, and provide you with handouts you can use to communicate with your doctor.