I've been using a Vit B-12 Quick Dissolve under the tongue; it's 2500 mcg by Nature's Bounty. Because my blood tests lately have said there was too much B-12 in my system, I now take it every other day, but I will not quit taking it because it seems to be the key reason I haven't had mouth sores for years now. However, I noticed that some one posting here uses Amitriptyline to treat hers and I also take that for another reason; perhaps that's part of my success in treating BMS !