Who knew a little B12 could make a person feel so good. I found out recently that I have really low B12 levels categorized as anemia. I thought my low energy was because of my thyroid (Hashimotos disease). It is odd since I am not a vegetarian, evidently it has taken years for my B12 levels to get this low. I think it must have been such a gradual decline that it was hard to realize that it was happening. The hematologist still do not know why my body is not absorbing it from my food, but at least Pernicious Anemia has been ruled out. The important thing to know is low B12 can lead to depression, nerve damage and cause some really bad health problems if not taken care of. I want to encourage anyone who has very low energy to get their B12 checked.