Hi, I have serious mouth ulcers problem and have  taken blood test and found that i am having serious B12 deficiency. And I am taking Neurobin injections since 4 months i e. Once a week and daily taking b12 capsules. But if I stop taking injections then again these ulcers comes. So what do i do now. I am Vegeterian, so do I have to take these medications for life long or the b12 is not getting absorbed in my body. Its been 4 months and I think after taking medicine for so long b12 level should have got increased.