I took care of my husband until he passed away. While taking care of him I never gave myself a chance to relax. After his funeral when I was finally all alone I realized that I was exhausted. I felt very tired. I mentioned this to one of my daughters and she gave me some B12 vitamins. And you know what? It helped! I could energy return in my body. I'm almost 70 years old. Everything you say in this article is PROVEN.