I have pernicious anemia so if I don't take B12 shots I simply die. You can never take to much B12. I loaded when first DX I took 6 shots in 6 days. I am now on weekly shots of cyno. I have heard that several people like the mythle. My labs tend to run about 1500-1700. But after treatment with b12 is started you'll never get a real reading.

You just have to find what brand works best for you. I know a lot of people with Pernicious anemia inject every other day. I try to make it 10 days or until I can't stand the numbness in my hands. I took a long time to DX and I have permanent nerve damage. I took over 2 years to get MVC MCH in check.