I also know EXACTLY what you mean, I started 'buzzing a few months back' I first noticed it about 2 hours after taking my first ever 2mg of methylcobalamin. Needless to say I didnt take anymore for a while afterwards because the 'buzzing' kept coming and going for weeks after. Then I started taking the methylcobalamin again about 2 weeks ago as ive heard and been advised that it is the No 1 supplement to take for neuorpathy,im taking 5mg a day,still getting weird bouts of 'buzzing' usually throughout my whole body and also on about 3 occasions when im standing it feels like my feet are on a vibrating matt. But one thing I have to say is that in the past 7 days or so I have noticed a marked reduction in the numbness/altered sensations, not sure if I am just having a 'good' few days or whether the methyl b12 really is helping the symptoms (although it seems to be helping mighty fast,as its ive only been taking them for 2 weeks!!) Also for some strange reason my emotions seem to have calmed right down as well and I feel in a better mood.It may just be the placebo effect I guess.....