I have had PA for years and have been able to control it with Methyl injections. The Federal Drug Administration here in the states has put many regulations on pharmacies so my pharmacy stopped creating the Methyl B12. I found another pharmacy in Michigan that creates methyl so I thought I was good. But now after being on the methyl from the new pharmacy after about 2 months, some of my symptoms are coming back. I guess the question is are there different forms of Methyl B12? I am trying to figure out why the symptoms are coming back even though I am still on Methyl B12 and have been for 7-8 years. Thanks much for any help here.