Hi, Pat,
Without the ileum, B12 cannot be absorbed from food. However, the B12 in pill form can be absorbed in the stomach. It is best to take higher dosages because the absorption rate is not efficient. Sublinqual probably gets you more, faster, but pills do work just fine. I was told by my urosurgeon to take a daily vitamin pill that contained B12 after my RC/ileal neobladder surgery. Because my B12 dropped considerably after my surgery, I also take a separate B12 pill to supplement the daily vitamin pill. I know other neobladder patients that have been able to keep their B12 levels high by using the oral pill form. Here is a quote from and a link to an article from the Family Physican Journal that addresses B12 absorption, deficiency, and treatment:
"Because most clinicians are generally unaware that oral vitamin B12 therapy is effective,17 the traditional treatment for B12 deficiency has been intramuscular injections. However, since as early as 1968, oral vitamin B12 has been shown to have an efficacy equal to that of injections in the treatment of pernicious anemia and other B12 deficiency states.9,17-19 "....
"Although the daily requirement of vitamin B12 is approximately 2 mcg, the initial oral replacement dosage consists of a single daily dose of 1,000 to 2,000 mcg (Table 4). This high dose is required because of the variable absorption of oral vitamin B12 in doses of 500 mcg or less.19 This regimen has been shown to be safe, cost-effective, and well tolerated by patients.19"
www.aafp.org/afp/20030301/979.html
Since B12 in pill form is an over-the-counter product, I do know what you mean about the shot form being the only one approved by the FDA.
My best to you,
LindaW