B12 deficiency has been found to be common amongst those suffering from MS. Previously, B12 deficiency was not recognized in MS patients, and as such, treatment with B12 was not considered. However, recent tests have shown that the symptoms of MS patients treated with B12 injections did not have deterioration of their condition. This was a positive sign in a disease that almost always gets worse.
I hope that this was a bit helpful for you.
Peace and Blessings