Hi Paul, and welcome to NeuroTalk.

I hope someone comes by who has had experience with this.

I looked up information on the cynacobalamin (?) and here is the link. (It lists side effects.) http://www.nlm.nih.gov/medlineplus/d...r/a605007.html

Here is a link to hydroxocobalamin. http://www.medicinenet.com/hydroxoco...le/article.htm

I don't see that either of them mention acne as a problem, but then...in my 'medicine' adventures, I've come up with side effects that are so rare, the doctors could only agree with me after looking them up in whatever books the use, lol. For instance...every time I've tried to take prozac (which was 3 different times) I would get a very rigid neck in the back. Felt like someone shoved a 2x4 in there and was even difficult to move my head back and forth. Sure enough, it was listed as one of the rarest of rarest side effects. I'd go off prozac and it would go away.

Anyway, I don't have any experience with B-12 but I know there are a lot of folks who do.

Oops, I just now discovered that YOU already discovered the vitamins forum, so I'll say no more.

Just, welcome!!!! I hope you figure it out.

As an adult acne sufferer, I totally sympathize with you. Mine are sporadic, so I get cortisone injections when one pops up. Totally gets rid of it.