No, if your colon is removed you don't necessarily need B-12 shots. You only would need them if the surgeon took a portion of your terminal ileum or if it was damaged. Not many jpouchers need B-12 shots. As a precaution, though, I get my B-12 levels measured once per year through an annual CBC.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free